# Global Postfix configuration file. This file lists only a subset
# of all parameters. For the syntax, and for a complete parameter
# list, see the postconf(5) manual page (command: "man 5 postconf").
#
# For common configuration examples, see BASIC_CONFIGURATION_README
# and STANDARD_CONFIGURATION_README. To find these documents, use
# the command "postconf html_directory readme_directory", or go to
# http://www.postfix.org/BASIC_CONFIGURATION_README.html etc.
#
# For best results, change no more than 2-3 parameters at a time,
# and test if Postfix still works after every change.

# COMPATIBILITY
#
# The compatibility_level determines what default settings Postfix
# will use for main.cf and master.cf settings. These defaults will
# change over time.
#
# To avoid breaking things, Postfix will use backwards-compatible
# default settings and log where it uses those old backwards-compatible
# default settings, until the system administrator has determined
# if any backwards-compatible default settings need to be made
# permanent in main.cf or master.cf.
#
# When this review is complete, update the compatibility_level setting
# below as recommended in the RELEASE_NOTES file.
#
# The level below is what should be used with new (not upgrade) installs.
#
compatibility_level = 2

# SOFT BOUNCE
#
# The soft_bounce parameter provides a limited safety net for
# testing.  When soft_bounce is enabled, mail will remain queued that
# would otherwise bounce. This parameter disables locally-generated
# bounces, and prevents the SMTP server from rejecting mail permanently
# (by changing 5xx replies into 4xx replies). However, soft_bounce
# is no cure for address rewriting mistakes or mail routing mistakes.
#
#soft_bounce = no

# LOCAL PATHNAME INFORMATION
#
# The queue_directory specifies the location of the Postfix queue.
# This is also the root directory of Postfix daemons that run chrooted.
# See the files in examples/chroot-setup for setting up Postfix chroot
# environments on different UNIX systems.
#
queue_directory = @PREFIX@/var/spool/postfix

# The command_directory parameter specifies the location of all
# postXXX commands.
#
command_directory = @PREFIX@/sbin

# The daemon_directory parameter specifies the location of all Postfix
# daemon programs (i.e. programs listed in the master.cf file). This
# directory must be owned by root.
#
daemon_directory = @PREFIX@/libexec/postfix

# The data_directory parameter specifies the location of Postfix-writable
# data files (caches, random numbers). This directory must be owned
# by the mail_owner account (see below).
#
data_directory = @PREFIX@/var/lib/postfix

# QUEUE AND PROCESS OWNERSHIP
#
# The mail_owner parameter specifies the owner of the Postfix queue
# and of most Postfix daemon processes.  Specify the name of a user
# account THAT DOES NOT SHARE ITS USER OR GROUP ID WITH OTHER ACCOUNTS
# AND THAT OWNS NO OTHER FILES OR PROCESSES ON THE SYSTEM.  In
# particular, don't specify nobody or daemon. PLEASE USE A DEDICATED
# USER.
#
mail_owner = _postfix

# The default_privs parameter specifies the default rights used by
# the local delivery agent for delivery to external file or command.
# These rights are used in the absence of a recipient user context.
# DO NOT SPECIFY A PRIVILEGED USER OR THE POSTFIX OWNER.
#
default_privs = nobody

# INTERNET HOST AND DOMAIN NAMES
# 
# The myhostname parameter specifies the internet hostname of this
# mail system. The default is to use the fully-qualified domain name
# from gethostname(). $myhostname is used as a default value for many
# other configuration parameters.
#
#myhostname = host.domain.tld
#myhostname = virtual.domain.tld

# The mydomain parameter specifies the local internet domain name.
# The default is to use $myhostname minus the first component.
# $mydomain is used as a default value for many other configuration
# parameters.
#
#mydomain = domain.tld

# SENDING MAIL
# 
# The myorigin parameter specifies the domain that locally-posted
# mail appears to come from. The default is to append $myhostname,
# which is fine for small sites.  If you run a domain with multiple
# machines, you should (1) change this to $mydomain and (2) set up
# a domain-wide alias database that aliases each user to
# user@that.users.mailhost.
#
# For the sake of consistency between sender and recipient addresses,
# myorigin also specifies the default domain name that is appended
# to recipient addresses that have no @domain part.
#
#myorigin = $myhostname
#myorigin = $mydomain

# RECEIVING MAIL

# The inet_interfaces parameter specifies the network interface
# addresses that this mail system receives mail on.  By default,
# the software claims all active interfaces on the machine. The
# parameter also controls delivery of mail to user@[ip.address].
#
# See also the proxy_interfaces parameter, for network addresses that
# are forwarded to us via a proxy or network address translator.
#
# Note: you need to stop/start Postfix when this parameter changes.
#
#inet_interfaces = all
#inet_interfaces = $myhostname
#inet_interfaces = $myhostname, localhost

# The proxy_interfaces parameter specifies the network interface
# addresses that this mail system receives mail on by way of a
# proxy or network address translation unit. This setting extends
# the address list specified with the inet_interfaces parameter.
#
# You must specify your proxy/NAT addresses when your system is a
# backup MX host for other domains, otherwise mail delivery loops
# will happen when the primary MX host is down.
#
#proxy_interfaces =
#proxy_interfaces = 1.2.3.4

# The mydestination parameter specifies the list of domains that this
# machine considers itself the final destination for.
#
# These domains are routed to the delivery agent specified with the
# local_transport parameter setting. By default, that is the UNIX
# compatible delivery agent that lookups all recipients in /etc/passwd
# and /etc/aliases or their equivalent.
#
# The default is $myhostname + localhost.$mydomain + localhost.  On
# a mail domain gateway, you should also include $mydomain.
#
# Do not specify the names of virtual domains - those domains are
# specified elsewhere (see VIRTUAL_README).
#
# Do not specify the names of domains that this machine is backup MX
# host for. Specify those names via the relay_domains settings for
# the SMTP server, or use permit_mx_backup if you are lazy (see
# STANDARD_CONFIGURATION_README).
#
# The local machine is always the final destination for mail addressed
# to user@[the.net.work.address] of an interface that the mail system
# receives mail on (see the inet_interfaces parameter).
#
# Specify a list of host or domain names, /file/name or type:table
# patterns, separated by commas and/or whitespace. A /file/name
# pattern is replaced by its contents; a type:table is matched when
# a name matches a lookup key (the right-hand side is ignored).
# Continue long lines by starting the next line with whitespace.
#
# See also below, section "REJECTING MAIL FOR UNKNOWN LOCAL USERS".
#
#mydestination = $myhostname, localhost.$mydomain, localhost
#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,
#	mail.$mydomain, www.$mydomain, ftp.$mydomain

# REJECTING MAIL FOR UNKNOWN LOCAL USERS
#
# The local_recipient_maps parameter specifies optional lookup tables
# with all names or addresses of users that are local with respect
# to $mydestination, $inet_interfaces or $proxy_interfaces.
#
# If this parameter is defined, then the SMTP server will reject
# mail for unknown local users. This parameter is defined by default.
#
# To turn off local recipient checking in the SMTP server, specify
# local_recipient_maps = (i.e. empty).
#
# The default setting assumes that you use the default Postfix local
# delivery agent for local delivery. You need to update the
# local_recipient_maps setting if:
#
# - You define $mydestination domain recipients in files other than
#   /etc/passwd, /etc/aliases, or the $virtual_alias_maps files.
#   For example, you define $mydestination domain recipients in    
#   the $virtual_mailbox_maps files.
#
# - You redefine the local delivery agent in master.cf.
#
# - You redefine the "local_transport" setting in main.cf.
#
# - You use the "luser_relay", "mailbox_transport", or "fallback_transport"
#   feature of the Postfix local delivery agent (see local(8)).
#
# Details are described in the LOCAL_RECIPIENT_README file.
#
# Beware: if the Postfix SMTP server runs chrooted, you probably have
# to access the passwd file via the proxymap service, in order to
# overcome chroot restrictions. The alternative, having a copy of
# the system passwd file in the chroot jail is just not practical.
#
# The right-hand side of the lookup tables is conveniently ignored.
# In the left-hand side, specify a bare username, an @domain.tld
# wild-card, or specify a user@domain.tld address.
# 
#local_recipient_maps = unix:passwd.byname $alias_maps
#local_recipient_maps = proxy:unix:passwd.byname $alias_maps
#local_recipient_maps =

# The unknown_local_recipient_reject_code specifies the SMTP server
# response code when a recipient domain matches $mydestination or
# ${proxy,inet}_interfaces, while $local_recipient_maps is non-empty
# and the recipient address or address local-part is not found.
#
# The default setting is 550 (reject mail) but it is safer to start
# with 450 (try again later) until you are certain that your
# local_recipient_maps settings are OK.
#
unknown_local_recipient_reject_code = 550

# TRUST AND RELAY CONTROL

# The mynetworks parameter specifies the list of "trusted" SMTP
# clients that have more privileges than "strangers".
#
# In particular, "trusted" SMTP clients are allowed to relay mail
# through Postfix.  See the smtpd_recipient_restrictions parameter
# in postconf(5).
#
# You can specify the list of "trusted" network addresses by hand
# or you can let Postfix do it for you (which is the default).
#
# By default (mynetworks_style = subnet), Postfix "trusts" SMTP
# clients in the same IP subnetworks as the local machine.
# On Linux, this does works correctly only with interfaces specified
# with the "ifconfig" command.
# 
# Specify "mynetworks_style = class" when Postfix should "trust" SMTP
# clients in the same IP class A/B/C networks as the local machine.
# Don't do this with a dialup site - it would cause Postfix to "trust"
# your entire provider's network.  Instead, specify an explicit
# mynetworks list by hand, as described below.
#  
# Specify "mynetworks_style = host" when Postfix should "trust"
# only the local machine.
# 
#mynetworks_style = class
#mynetworks_style = subnet
#mynetworks_style = host

# Alternatively, you can specify the mynetworks list by hand, in
# which case Postfix ignores the mynetworks_style setting.
#
# Specify an explicit list of network/netmask patterns, where the
# mask specifies the number of bits in the network part of a host
# address.
#
# You can also specify the absolute pathname of a pattern file instead
# of listing the patterns here. Specify type:table for table-based lookups
# (the value on the table right-hand side is not used).
#
#mynetworks = 168.100.189.0/28, 127.0.0.0/8
#mynetworks = $config_directory/mynetworks
#mynetworks = hash:@PREFIX@/etc/postfix/network_table

# The relay_domains parameter restricts what destinations this system will
# relay mail to.  See the smtpd_recipient_restrictions description in
# postconf(5) for detailed information.
#
# By default, Postfix relays mail
# - from "trusted" clients (IP address matches $mynetworks) to any destination,
# - from "untrusted" clients to destinations that match $relay_domains or
#   subdomains thereof, except addresses with sender-specified routing.
# The default relay_domains value is $mydestination.
# 
# In addition to the above, the Postfix SMTP server by default accepts mail
# that Postfix is final destination for:
# - destinations that match $inet_interfaces or $proxy_interfaces,
# - destinations that match $mydestination
# - destinations that match $virtual_alias_domains,
# - destinations that match $virtual_mailbox_domains.
# These destinations do not need to be listed in $relay_domains.
# 
# Specify a list of hosts or domains, /file/name patterns or type:name
# lookup tables, separated by commas and/or whitespace.  Continue
# long lines by starting the next line with whitespace. A file name
# is replaced by its contents; a type:name table is matched when a
# (parent) domain appears as lookup key.
#
# NOTE: Postfix will not automatically forward mail for domains that
# list this system as their primary or backup MX host. See the
# permit_mx_backup restriction description in postconf(5).
#
#relay_domains = $mydestination

# INTERNET OR INTRANET

# The relayhost parameter specifies the default host to send mail to
# when no entry is matched in the optional transport(5) table. When
# no relayhost is given, mail is routed directly to the destination.
#
# On an intranet, specify the organizational domain name. If your
# internal DNS uses no MX records, specify the name of the intranet
# gateway host instead.
#
# In the case of SMTP, specify a domain, host, host:port, [host]:port,
# [address] or [address]:port; the form [host] turns off MX lookups.
#
# If you're connected via UUCP, see also the default_transport parameter.
#
#relayhost = $mydomain
#relayhost = [gateway.my.domain]
#relayhost = [mailserver.isp.tld]
#relayhost = uucphost
#relayhost = [an.ip.add.ress]

# REJECTING UNKNOWN RELAY USERS
#
# The relay_recipient_maps parameter specifies optional lookup tables
# with all addresses in the domains that match $relay_domains.
#
# If this parameter is defined, then the SMTP server will reject
# mail for unknown relay users. This feature is off by default.
#
# The right-hand side of the lookup tables is conveniently ignored.
# In the left-hand side, specify an @domain.tld wild-card, or specify
# a user@domain.tld address.
# 
#relay_recipient_maps = hash:@PREFIX@/etc/postfix_relay_recipients

# INPUT RATE CONTROL
#
# The in_flow_delay configuration parameter implements mail input
# flow control. This feature is turned on by default, although it
# still needs further development (it's disabled on SCO UNIX due
# to an SCO bug).
# 
# A Postfix process will pause for $in_flow_delay seconds before
# accepting a new message, when the message arrival rate exceeds the
# message delivery rate. With the default 100 SMTP server process
# limit, this limits the mail inflow to 100 messages a second more
# than the number of messages delivered per second.
# 
# Specify 0 to disable the feature. Valid delays are 0..10.
# 
#in_flow_delay = 1s

# ADDRESS REWRITING
#
# The ADDRESS_REWRITING_README document gives information about
# address masquerading or other forms of address rewriting including
# username->Firstname.Lastname mapping.

# ADDRESS REDIRECTION (VIRTUAL DOMAIN)
#
# The VIRTUAL_README document gives information about the many forms
# of domain hosting that Postfix supports.

# "USER HAS MOVED" BOUNCE MESSAGES
#
# See the discussion in the ADDRESS_REWRITING_README document.

# TRANSPORT MAP
#
# See the discussion in the ADDRESS_REWRITING_README document.

# ALIAS DATABASE
#
# The alias_maps parameter specifies the list of alias databases used
# by the local delivery agent. The default list is system dependent.
#
# On systems with NIS, the default is to search the local alias
# database, then the NIS alias database. See aliases(5) for syntax
# details.
# 
# If you change the alias database, run "postalias /etc/aliases" (or
# wherever your system stores the mail alias file), or simply run
# "newaliases" to build the necessary DBM or DB file.
#
# It will take a minute or so before changes become visible.  Use
# "postfix reload" to eliminate the delay.
#
#alias_maps = dbm:/etc/aliases
#alias_maps = hash:/etc/aliases
#alias_maps = hash:/etc/aliases, nis:mail.aliases
#alias_maps = netinfo:/aliases

# The alias_database parameter specifies the alias database(s) that
# are built with "newaliases" or "sendmail -bi".  This is a separate
# configuration parameter, because alias_maps (see above) may specify
# tables that are not necessarily all under control by Postfix.
#
#alias_database = dbm:/etc/aliases
#alias_database = dbm:/etc/mail/aliases
#alias_database = hash:/etc/aliases
#alias_database = hash:/etc/aliases, hash:/opt/majordomo/aliases

# ADDRESS EXTENSIONS (e.g., user+foo)
#
# The recipient_delimiter parameter specifies the separator between
# user names and address extensions (user+foo). See canonical(5),
# local(8), relocated(5) and virtual(5) for the effects this has on
# aliases, canonical, virtual, relocated and .forward file lookups.
# Basically, the software tries user+foo and .forward+foo before
# trying user and .forward.
#
#recipient_delimiter = +

# DELIVERY TO MAILBOX
#
# The home_mailbox parameter specifies the optional pathname of a
# mailbox file relative to a user's home directory. The default
# mailbox file is /var/spool/mail/user or /var/mail/user.  Specify
# "Maildir/" for qmail-style delivery (the / is required).
#
#home_mailbox = Mailbox
#home_mailbox = Maildir/
 
# The mail_spool_directory parameter specifies the directory where
# UNIX-style mailboxes are kept. The default setting depends on the
# system type.
#
#mail_spool_directory = /var/mail
#mail_spool_directory = /var/spool/mail

# The mailbox_command parameter specifies the optional external
# command to use instead of mailbox delivery. The command is run as
# the recipient with proper HOME, SHELL and LOGNAME environment settings.
# Exception:  delivery for root is done as $default_user.
#
# Other environment variables of interest: USER (recipient username),
# EXTENSION (address extension), DOMAIN (domain part of address),
# and LOCAL (the address localpart).
#
# Unlike other Postfix configuration parameters, the mailbox_command
# parameter is not subjected to $parameter substitutions. This is to
# make it easier to specify shell syntax (see example below).
#
# Avoid shell meta characters because they will force Postfix to run
# an expensive shell process. Procmail alone is expensive enough.
#
# IF YOU USE THIS TO DELIVER MAIL SYSTEM-WIDE, YOU MUST SET UP AN
# ALIAS THAT FORWARDS MAIL FOR ROOT TO A REAL USER.
#
#mailbox_command = /some/where/procmail
#mailbox_command = /some/where/procmail -a "$EXTENSION"

# The mailbox_transport specifies the optional transport in master.cf
# to use after processing aliases and .forward files. This parameter
# has precedence over the mailbox_command, fallback_transport and
# luser_relay parameters.
#
# Specify a string of the form transport:nexthop, where transport is
# the name of a mail delivery transport defined in master.cf.  The
# :nexthop part is optional. For more details see the sample transport
# configuration file.
#
# NOTE: if you use this feature for accounts not in the UNIX password
# file, then you must update the "local_recipient_maps" setting in
# the main.cf file, otherwise the SMTP server will reject mail for    
# non-UNIX accounts with "User unknown in local recipient table".
#
# Cyrus IMAP over LMTP. Specify ``lmtpunix      cmd="lmtpd"
# listen="/var/imap/socket/lmtp" prefork=0'' in cyrus.conf.
#mailbox_transport = lmtp:unix:/var/imap/socket/lmtp
#
# Cyrus IMAP via command line. Uncomment the "cyrus...pipe" and
# subsequent line in master.cf.
#mailbox_transport = cyrus

# The fallback_transport specifies the optional transport in master.cf
# to use for recipients that are not found in the UNIX passwd database.
# This parameter has precedence over the luser_relay parameter.
#
# Specify a string of the form transport:nexthop, where transport is
# the name of a mail delivery transport defined in master.cf.  The
# :nexthop part is optional. For more details see the sample transport
# configuration file.
#
# NOTE: if you use this feature for accounts not in the UNIX password
# file, then you must update the "local_recipient_maps" setting in
# the main.cf file, otherwise the SMTP server will reject mail for    
# non-UNIX accounts with "User unknown in local recipient table".
#
#fallback_transport = lmtp:unix:/file/name
#fallback_transport = cyrus
#fallback_transport =

# The luser_relay parameter specifies an optional destination address
# for unknown recipients.  By default, mail for unknown@$mydestination,
# unknown@[$inet_interfaces] or unknown@[$proxy_interfaces] is returned
# as undeliverable.
#
# The following expansions are done on luser_relay: $user (recipient
# username), $shell (recipient shell), $home (recipient home directory),
# $recipient (full recipient address), $extension (recipient address
# extension), $domain (recipient domain), $local (entire recipient
# localpart), $recipient_delimiter. Specify ${name?value} or
# ${name:value} to expand value only when $name does (does not) exist.
#
# luser_relay works only for the default Postfix local delivery agent.
#
# NOTE: if you use this feature for accounts not in the UNIX password
# file, then you must specify "local_recipient_maps =" (i.e. empty) in
# the main.cf file, otherwise the SMTP server will reject mail for    
# non-UNIX accounts with "User unknown in local recipient table".
#
#luser_relay = $user@other.host
#luser_relay = $local@other.host
#luser_relay = admin+$local
  
# JUNK MAIL CONTROLS
# 
# The controls listed here are only a very small subset. The file
# SMTPD_ACCESS_README provides an overview.

# The header_checks parameter specifies an optional table with patterns
# that each logical message header is matched against, including
# headers that span multiple physical lines.
#
# By default, these patterns also apply to MIME headers and to the
# headers of attached messages. With older Postfix versions, MIME and
# attached message headers were treated as body text.
#
# For details, see "man header_checks".
#
#header_checks = regexp:@PREFIX@/etc/postfix/header_checks

# FAST ETRN SERVICE
#
# Postfix maintains per-destination logfiles with information about
# deferred mail, so that mail can be flushed quickly with the SMTP
# "ETRN domain.tld" command, or by executing "sendmail -qRdomain.tld".
# See the ETRN_README document for a detailed description.
# 
# The fast_flush_domains parameter controls what destinations are
# eligible for this service. By default, they are all domains that
# this server is willing to relay mail to.
# 
#fast_flush_domains = $relay_domains

# SHOW SOFTWARE VERSION OR NOT
#
# The smtpd_banner parameter specifies the text that follows the 220
# code in the SMTP server's greeting banner. Some people like to see
# the mail version advertised. By default, Postfix shows no version.
#
# You MUST specify $myhostname at the start of the text. That is an
# RFC requirement. Postfix itself does not care.
#
#smtpd_banner = $myhostname ESMTP $mail_name
#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)

# PARALLEL DELIVERY TO THE SAME DESTINATION
#
# How many parallel deliveries to the same user or domain? With local
# delivery, it does not make sense to do massively parallel delivery
# to the same user, because mailbox updates must happen sequentially,
# and expensive pipelines in .forward files can cause disasters when
# too many are run at the same time. With SMTP deliveries, 10
# simultaneous connections to the same domain could be sufficient to
# raise eyebrows.
# 
# Each message delivery transport has its XXX_destination_concurrency_limit
# parameter.  The default is $default_destination_concurrency_limit for
# most delivery transports. For the local delivery agent the default is 2.

#local_destination_concurrency_limit = 2
#default_destination_concurrency_limit = 20

# DEBUGGING CONTROL
#
# The debug_peer_level parameter specifies the increment in verbose
# logging level when an SMTP client or server host name or address
# matches a pattern in the debug_peer_list parameter.
#
debug_peer_level = 2

# The debug_peer_list parameter specifies an optional list of domain
# or network patterns, /file/name patterns or type:name tables. When
# an SMTP client or server host name or address matches a pattern,
# increase the verbose logging level by the amount specified in the
# debug_peer_level parameter.
#
#debug_peer_list = 127.0.0.1
#debug_peer_list = some.domain
debug_peer_list = mit.edu

# The debugger_command specifies the external command that is executed
# when a Postfix daemon program is run with the -D option.
#
# Use "command .. & sleep 5" so that the debugger can attach before
# the process marches on. If you use an X-based debugger, be sure to
# set up your XAUTHORITY environment variable before starting Postfix.
#
debugger_command =
	 PATH=@PREFIX@/bin:/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
	 ddd $daemon_directory/$process_name $process_id & sleep 5

# If you can't use X, use this to capture the call stack when a
# daemon crashes. The result is in a file in the configuration
# directory, and is named after the process name and the process ID.
#
# debugger_command =
#	PATH=@PREFIX@/bin:/bin:/usr/bin:/usr/local/bin; export PATH; (echo cont;
#	echo where) | gdb $daemon_directory/$process_name $process_id 2>&1
#	>$config_directory/$process_name.$process_id.log & sleep 5
#
# Another possibility is to run gdb under a detached screen session.
# To attach to the screen session, su root and run "screen -r
# <id_string>" where <id_string> uniquely matches one of the detached
# sessions (from "screen -list").
#
# debugger_command =
#	PATH=@PREFIX@/bin:/bin:/usr/bin:/sbin:/usr/sbin; export PATH; screen
#	-dmS $process_name gdb $daemon_directory/$process_name
#	$process_id & sleep 1

# INSTALL-TIME CONFIGURATION INFORMATION
#
# The following parameters are used when installing a new Postfix version.
# 
# sendmail_path: The full pathname of the Postfix sendmail command.
# This is the Sendmail-compatible mail posting interface.
# 
sendmail_path = @PREFIX@/sbin/sendmail

# newaliases_path: The full pathname of the Postfix newaliases command.
# This is the Sendmail-compatible command to build alias databases.
#
newaliases_path = @PREFIX@/bin/newaliases

# mailq_path: The full pathname of the Postfix mailq command.  This
# is the Sendmail-compatible mail queue listing command.
# 
mailq_path = @PREFIX@/bin/mailq

# setgid_group: The group for mail submission and queue management
# commands.  This must be a group name with a numerical group ID that
# is not shared with other accounts, not even with the Postfix account.
#
setgid_group = _postdrop

# html_directory: The location of the Postfix HTML documentation.
#
html_directory = no

# manpage_directory: The location of the Postfix on-line manual pages.
#
manpage_directory = @PREFIX@/share/man

# sample_directory: The location of the Postfix sample configuration files.
# This parameter is obsolete as of Postfix 2.1.
#
sample_directory = @PREFIX@/share/postfix/sample

# readme_directory: The location of the Postfix README files.
#
readme_directory = @PREFIX@/share/postfix/readme
# inet_protocols = ipv4
# macOS Server v.5.6 configuration:
inet_protocols = all
meta_directory = @PREFIX@/etc/postfix
shlib_directory = @PREFIX@/libexec/postfix


#======================================================================

############################
# macOS Open Source Server #
############################
# Based on /Library/Server_v56/Mail/Config/postfix/main.cf,
# https://www.c0ffee.net/blog/mail-server-guide/

## Create these directories, files
# sudo mkdir @PREFIX@/var/log/mail
# sudo chmod go-rwx @PREFIX@/var/log/mail

## Create @PREFIX@/etc/postfix/sasl/passwd, passwd.db with secure permissions
# sudo rsync -a /Library/Server_v56/Mail/Config/postfix/sasl @PREFIX@/etc/postfix
# sudo newaliases
# sudo -u _postfix openssl dhparam -out @PREFIX@/var/lib/postfix/dh2048.pem 2048

## TLS authentication of mail relays
# openssl s_client -showcerts -servername smtp.comcast.net -connect smtp.comcast.net:587  -starttls smtp < /dev/null > smtp_comcast_net.pem
## For smtp_tls_CApath:
## break into three (or the necessary trust chain #) of .pem files delineated by
## '-----BEGIN CERTIFICATE-----'
## Use openssl x509 to track and check the trust chain:
# openssl x509 -text -noout -in COMODORSAAddTrustCA.pem | less
## Download and convert issuer certs based on e.g.
## "CA Issuers - URI:http://crt.comodoca.com/COMODORSAAddTrustCA.crt"
# curl -O http://crt.comodoca.com/COMODORSAAddTrustCA.crt
# openssl x509 -inform der -outform -pem -in COMODORSAAddTrustCA.crt -out COMODORSAAddTrustCA.pem
# rm COMODORSAAddTrustCA.crt
## Check the certificate chain of trust
# openssl verify -CAfile UTN-DATACorpSGC.pem AddTrustExternalCARoot.pem
# openssl verify -CAfile UTN-DATACorpSGC.pem -untrusted AddTrustExternalCARoot.pem COMODORSAAddTrustCA.pem
## Compate SHA1 hashes of issuers in the chain
# openssl x509 -text -noout -in smtp_comcast_net.pem | grep -A1 "Authority Key Identifier" | tail -1
# openssl x509 -text -noout -in COMODORSAOrganizationValidationSecureServerCA.pem | grep -A1 "Subject Key Identifier" | tail -1
## Create smtp_tls_CApath under ./postfix (for chroot jail) and copy the files:
# sudo mkdir -p @PREFIX@/etc/postfix/etc/certificates
# sudo cp *.pem @PREFIX@/etc/postfix/etc/certificates
# sudo chgrp -R mail @PREFIX@/etc/postfix/etc/certificates
# sudo dseditgroup -o edit -a _postfix -t user mail
# sudo dseditgroup -o edit -a _dovecot -t user mail
# sudo dseditgroup -o edit -a _dovenull -t user mail
# dscacheutil -q group -a name certusers
# dscacheutil -q group -a name mail
## For smtp_tls_CAfile:
# vi smtp_comcast_net.pem  # delete non-certificate outputs before 1st --- and after last ---

## SASL authentication for mail relays
# sudo mkdir @PREFIX@/etc/postfix/sasl
# sudo vi @PREFIX@/etc/postfix/sasl/passwd
# sudo chgrp -R _postfix @PREFIX@/etc/postfix/sasl
# sudo chmod -R o-rwx @PREFIX@/etc/postfix/sasl
# sudo postmap @PREFIX@/etc/postfix/sasl/passwd

## NOTE: Do *not* copy over HUGE Berkeley .db files from High Sierra APNS file systems;
## this APNS/Berkeley DB bug was fixed in Mojave, which doesn't run Server.app v.5.6.
## Rather,
# sudo find /Library/Server_v56/Mail/Config -type f -name '*.db' -exec sudo du -sm {} ';' | sort -rn
## to find affected files, then use postmap to recreate them on the new server.
## The only way to fix these on an old server is to create the .db files on
## an attached HDFS drive, then create symbolic links on the High Sierra APNS drive.
## Observed to be necessary for /Library/Server/Mail/Data/scanner/amavis/.spamassassin/, ./postfix/*.db

# Debugging
# mailq
# sudo postsuper -d ALL
# sudo vi @PREFIX@/etc/postfix/main.cf
# sudo bash -c 'postfix reload ; sleep 1 ; nmap -p 25 localhost ; lsof -i ":25" ; postfix status ; postfix check'
# sendmail -vt < ~/mail.txt
# sudo less @PREFIX@/var/log/mail/postfix.log

## mail.txt
# To: me@isp.net
# Subject: postfix configuration test
# From: admin@domain.tld
# 
# My first SMTP email test.

# Logging
maillog_file = @PREFIX@/var/log/mail/postfix.log
maillog_file_compressor = bzip2
maillog_file_prefixes = @PREFIX@/var/log/mail
# maillog_file_rotate_suffix = 

# macOS Server v.5.6 configuration:
smtp_tls_loglevel = 1

# use 0 for Postfix >= 2.9, and 1 for earlier versions
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_tls_loglevel = 0

# macOS Server v.5.6 configuration settings that do not appear elsewhere
# Commented-out settings are often specific to macOS Server.app's postfix build

# dovecot
# macOS Server v.5.6 configuration:
# dovecot_destination_recipient_limit = 1

# Alias maps, database if mailman is used
# alias_maps = hash:@PREFIX@/etc/postfix/aliases, hash:@PREFIX@/var/mailman/data/aliases
# alias_database = hash:@PREFIX@/etc/postfix/aliases, hash:@PREFIX@/var/mailman/data/aliases

# Protect SSL/TLS encryption keys
tls_random_source = dev:/dev/urandom

# (APPLE) Credentials for using URLAUTH with IMAP servers.
# imap_submit_cred_file = /Library/Server/Mail/Config/postfix/submit.cred

# (APPLE) The SACL cache caches the results of Mail Service ACL lookups.
# Tune these to make the cache more responsive to changes in the SACL.
# The cache is only in memory, so bouncing the sacl-cache service clears it.
# use_sacl_cache = yes
# sacl_cache_positive_expire_time = 7d
# sacl_cache_negative_expire_time = 1d
# sacl_cache_disabled_expire_time = 1m

# (APPLE) Reject messages having any MIME body part (attachment, etc.)
# larger than this number of bytes.  0, the default, means no limit.
# mime_max_body_size = 0
#======================================================================
# macOS Server v.5.6 configuration:
# mydomain_fallback = localhost
mynetworks = 127.0.0.0/8, [::1]/128
inet_interfaces = all
# macOS Server v.5.6 configuration; site-specific, pre-defined
# config_directory = /Library/Server/Mail/Config/postfix
# smtpd_require_virtual_map = yes
# virtual_alias_domains = $virtual_alias_maps, hash:@PREFIX@/etc/postfix/virtual_domains
# virtual_alias_maps = $virtual_maps, hash:@PREFIX@/etc/postfix/virtual_users
# macOS Server v.5.6 configuration:
# enable_server_options = yes
# smtpd_pw_server_security_options = cram-md5,digest-md5,gssapi,login,plain
# content_filter = smtp-amavis:[127.0.0.1]:10024
# macOS Server v.5.6 configuration:
# smtpd_use_pw_server = yes
header_checks = pcre:@PREFIX@/etc/postfix/custom_header_checks
recipient_canonical_maps = hash:@PREFIX@/etc/postfix/system_user_maps
postscreen_dnsbl_sites = zen.spamhaus.org*2
mailbox_transport = lmtp:unix:private/dovecot-lmtp
# Added by Server.app>Mail>Filtering Settings... > Enable greylist filtering
# smtpd_recipient_restrictions = permit_sasl_authenticated reject_unauth_destination check_policy_service unix:private/policy permit
# SMTP Recipient and Relay Restrictions
# http://www.postfix.org/SMTPD_ACCESS_README.html
# https://bbs.archlinux.org/viewtopic.php?id=158020
# http://superuser.com/questions/664516/noqueue-reject-relay-access-denied
#smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, check_policy_service unix:private/policy permit
#smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, defer_unauth_destination
compatibility_level = 2

# disable "new mail" notifications for local users
biff = no

# Name of this mail server, used in the SMTP HELO for outgoing mail. Make
# sure this resolves to the same IP as your reverse DNS hostname.
myhostname = mail.@domain@.@tld@

mydomain = @domain@.@tld@

# Domains for which postfix will deliver local mail. Does not apply to
# virtual domains, which are configured below. Make sure to specify the FQDN
# of your sever, as well as localhost.
# Note: NEVER specify any virtual domains here!!! Those come later.
# macOS Server v.5.6 configuration:
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

# Domain appended to mail sent locally from this machine - such as mail sent
# via the `sendmail` command.
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
myorigin = $mydomain

# prevent spammers from searching for valid users
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
disable_vrfy_command = yes

# require properly formatted email addresses - prevents a lot of spam
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
strict_rfc821_envelopes = yes

# don't give any helpful info when a mailbox doesn't exist
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
show_user_unknown_table_name = no

# limit maximum e-mail size to 25MB. mailbox size must be at least as big as
# the message size for the mail to be accepted, but has no meaning after
# that since we are using Dovecot for delivery.
# default mailbox size limit set to no limit
message_size_limit = 25165824
mailbox_size_limit = 0

# require addresses of the form "user@domain.tld"
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
allow_percent_hack = no
swap_bangpath = no

# allow plus-aliasing: "user+tag@domain.tld" delivers to "user" mailbox
# Handle both Postfix and qmail extensions (Postfix 2.11 and later).
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)

# `recipient_delimiter = +` used by CalendarServer
# Do *not* use `smtpd_recipient_restrictions = reject_unverified_recipient …`
# if `recipient_delimiter = yes` *and* dovecot-lmtp is used; also see
# dovecot/conf.d/15-lda.conf and dovecot/conf.d/20-lmtp.conf
recipient_delimiter = +

# PKI for Client (smtp) and Server (smtpd)

# To use macOS Server v5.10 generated certificates:
#
# 0. Identify the file that looks like @host@.@domain@.@tld@.@CERTIFICATE_SHA1@.cert.pem
# and verify its issue date and issuer "* Intermediate CA" with:
#
# $ ls /etc/certificates
# $ openssl x509 -inform pem -in /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.cert.pem -text -noout
# $ openssl x509 -noout -fingerprint -sha1 -inform pem -in openssl x509 -noout -fingerprint -sha1 -inform pem -in /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.cert.pem | tr -d ':' | sed -e 's|^SHA1 Fingerprint=||' | tr -d ':' | sed -e 's|^SHA1 Fingerprint=||'
# 
# Use this SHA1 to obtain the passphraphse for this certificate's private key from:
#
# Keychain Access.app> System> Search for this SHA1>
#   Double-click "Mac OS X Server certificate management"> Show password
#
# 1. Create a secure storage for this passphrase and desctrypted key:
# 
# $ sudo mkdir -p @PREFIX@/etc/certificates/private
# $ sudo chmod 0700 @PREFIX@/etc/certificates/private
# $ sudo vi @PREFIX@/etc/certificates/private/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.key.pem.passphrase /etc/certificates/private
# $ sudo chmod -R go-rwx @PREFIX@/etc/certificates/private
# 
# `ssl_key_password` wasn't working on my install, so put the decrypted key in @PREFIX@/etc/certificates/private
# 
# $ sudo openssl pkey -in /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.key.pem -out @PREFIX@/etc/certificates/private/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.key.pem.decrypted -passin file:@PREFIX@/etc/certificates/private/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.key.pem.passphrase
# $ sudo chmod -R go-rwx @PREFIX@/etc/certificates/private
# 
# 2. Link to the existing TLS chain.
#
# $ sudo ln -s /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.cert.pem @PREFIX@/etc/certificates
# $ sudo ln -s /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.key.pem @PREFIX@/etc/certificates
# $ sudo ln -s /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.chain.pem @PREFIX@/etc/certificates
# $ sudo ln -s /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.concat.pem @PREFIX@/etc/certificates
# 
# 3. Confirm restricted permissions:
#
# $ ls -l @PREFIX@/etc/certificates
# $ sudo ls -l @PREFIX@/etc/certificates/private
#
# 4. Finally, reconfigure dovecot's conf.d/10-ssl.conf, postfix's master.cf,
# and, if installed, calendar-contacts-server's proxy nginx.conf:
#
# $ sudo vi @PREFIX@/etc/dovecot/conf.d/10-ssl.conf
# $ sudo vi @PREFIX@/etc/postfix/main.cf
# $ sudo vi @PREFIX@/var/calendarserver/Library/CalendarServer/etc/nginx.conf

# Enter the filenames directly (not the `default_certificate` link) because key files are also necessary
smtpd_tls_chain_files = @PREFIX@/etc/certificates/private/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.key.pem.decrypted /etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.chain.pem

# Put this Server.app certificate in smtp_tls_CApath; see below
# smtp_tls_CAfile = @PREFIX@/etc/postfix/etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.chain.pem
smtp_tls_CAfile = @PREFIX@/etc/certificates/@host@.@domain@.@tld@.@CERTIFICATE_SHA1@.chain.pem

# smtp_ (postfix client) configuration

smtp_enforce_tls = yes

# These two lines define how postfix will connect to other mail servers.
# DANE is a stronger form of opportunistic TLS. You can read about it here:
# http://www.postfix.org/TLS_README.html#client_tls_dane
smtp_tls_security_level = dane
smtp_dns_support_level = dnssec
# DANE requires a DNSSEC capable resolver. If your DNS resolver doesn't
# support DNSSEC, remove the above two lines and uncomment the below:
# Implement DNSSEC if named is ever put outside the firewall, and DNSSEC infrastructure uses ED25519
# smtp_tls_security_level = may

# macOS Server v.5.6 configuration:
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
smtp_tls_protocols = !SSLv2, !SSLv3

# Trimmed cipherlist improves interoperability with old Exchange servers
# and reduces exposure to obsolete and rarely used crypto.  See:
# http://www.postfix.org/postconf.5.html#smtp_tls_exclude_ciphers
# http://www.postfix.org/postconf.5.html#smtpd_tls_exclude_ciphers
smtp_tls_exclude_ciphers = EXPORT, LOW, MD5, aDSS, kECDHe, kECDHr, kDHd, kDHr, SEED, IDEA, RC2

# SMTP Relay and SASL Authentication Configuration
# macOS Server v.5.6 configuration:
# `relayhost` is the host:port of the SMTP relay e.g. smtp.comcast.net:587
relayhost = [@RELAYHOST@]:submission
# `smtp_sasl_password_maps` has SMTP server authentication credentials of the form:
# [host]:port\t username:password\n [\t == <tab>, \n == <newline>]
# with group ownership _postfix and no "other" permissions:
# sudo mkdir @PREFIX@/etc/postfix/sasl
# sudo vi @PREFIX@/etc/postfix/sasl/passwd
# sudo chgrp -R _postfix @PREFIX@/etc/postfix/sasl
# sudo chmod -R o-rwx @PREFIX@/etc/postfix/sasl
# sudo postmap @PREFIX@/etc/postfix/sasl/passwd
smtp_sasl_password_maps = hash:@PREFIX@/etc/postfix/sasl/passwd
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_tls_security_options = noanonymous
smtp_sasl_mechanism_filter = plain, gssapi

# `smtp_tls_CApath` is the directory with the certificate authorities for the SMTP relay and/or servers
# `postfix check` says that these must belong to root.
# Example retrieval of this certificate chain from ISP:
# echo "quit" | openssl s_client -showcerts -servername smtp.comcast.net -connect smtp.comcast.net:587  -starttls smtp > smtp_comcast_net.pem
## For smtp_tls_CApath:
## break into three (or the necessary trust chain #) of .pem files delineated by
## '-----BEGIN CERTIFICATE-----'
## Use openssl x509 to track and check the trust chain:
# openssl x509 -text -noout -in COMODORSAAddTrustCA.pem | less
## Download and convert issuer certs based on e.g.
## "CA Issuers - URI:http://crt.comodoca.com/COMODORSAAddTrustCA.crt"
# curl -O http://crt.comodoca.com/COMODORSAAddTrustCA.crt
# openssl x509 -inform der -outform -pem -in COMODORSAAddTrustCA.crt -out COMODORSAAddTrustCA.pem
# rm COMODORSAAddTrustCA.crt
## Check the certificate chain of trust
# openssl verify -CAfile UTN-DATACorpSGC.pem AddTrustExternalCARoot.pem
# openssl verify -CAfile UTN-DATACorpSGC.pem -untrusted AddTrustExternalCARoot.pem COMODORSAAddTrustCA.pem
## Compate SHA1 hashes of issuers in the chain
# openssl x509 -text -noout -in smtp_comcast_net.pem | grep -A1 "Authority Key Identifier" | tail -1
# openssl x509 -text -noout -in COMODORSAOrganizationValidationSecureServerCA.pem | grep -A1 "Subject Key Identifier" | tail -1
## Create smtp_tls_CApath under ./postfix (for chroot jail) and copy the files:
# sudo mkdir -p @PREFIX@/etc/postfix/etc/certificates
# sudo cp *.pem @PREFIX@/etc/postfix/etc/certificates
# sudo chgrp -R mail @PREFIX@/etc/postfix/etc/certificates
# sudo dseditgroup -o edit -a _postfix -t user mail
# sudo dseditgroup -o edit -a _dovecot -t user mail
# sudo dseditgroup -o edit -a _dovenull -t user mail
# dscacheutil -q group -a name certusers
# dscacheutil -q group -a name mail
smtp_tls_CApath = @PREFIX@/etc/postfix/etc/certificates

## For smtp_tls_CAfile:
# vi smtp_comcast_net.pem  # delete non-certificate outputs before 1st --- and after last ---
# concatenate Server.app's hostname.domainname.SHA-1.cert.pem file into this file
# smtp_tls_CAfile = @PREFIX@/etc/postfix/etc/certificates/smtp_tls_CAfile.pem

# IP address used by postfix to send outgoing mail. You only need this if
# your machine has multiple IP addresses - set it to your MX address to
# satisfy your SPF record.
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
# smtp_bind_address = my IP == `host $mydomain`
# smtp_bind_address6 = my IPv6 == `host -6 $mydomain`

# macOS Server v.5.6 configuration that doesn't appear elewhere

# smtpd (postfix server) configuration

# Also see this for rationale on postfix TLS configuration:
# https://drownattack.com/postfix.html
# https://serverfault.com/questions/693179/postfix-mandatory-smtp-smtpd-vs-not-mandatory-difference-and-configuration

# allow other mail servers to connect using TLS, but don't require it
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_tls_security_level = may

# macOS Server v.5.6 configuration:
smtpd_enforce_tls = no
smtpd_use_tls = yes

# Here we define the options for "mandatory" TLS. In our setup, TLS is only
# "mandatory" for authenticating users. I got these settings from Mozilla's
# SSL reccomentations page.
#
# NOTE: do not attempt to make TLS mandatory for all incoming/outgoing
# connections. Do not attempt to change the default cipherlist for non-
# mandatory connections either. There are still a lot of mail servers out
# there that do not use TLS, and many that do only support old ciphers.
# Forcing TLS for everyone *will* cause you to lose mail.
# man 5 postconf /smtpd_tls_mandatory_protocols: "Explicitly listing the protocols to include, rather than protocols to exclude, is supported, but not recommended."
# Note: if `smtpd_tls_security_level = may`, then bad encryption is better than no encryption;
# therefore, do *not* set smtpd_tls_mandatory_protocols or smtpd_tls_protocols to be too restrictive
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtpd_tls_protocols = !SSLv2, !SSLv3
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_tls_mandatory_ciphers = high
# macOS Server v.5.6 configuration:
smtpd_tls_ciphers = medium
# man 5 postconf /tls_high_cipherlist: "You are strongly encouraged to not change this setting."
# tls_high_cipherlist = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256

# macOS Server v.5.6 configuration:
# smtpd_tls_protocols = !SSLv2, !SSLv3
# smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3

# List of ciphers or cipher types to exclude from the SMTP server cipher
# list at all TLS security levels.
# # macOS Server v.5.6 configuration:
# smtpd_tls_exclude_ciphers = SSLv2, 3DES, aNULL, ADH, eNULL, EXPORT
smtpd_tls_exclude_ciphers = SSLv2, 3DES, aNULL, ADH, eNULL, EXPORT, LOW, MD5, SEED, IDEA, RC2

# Enable forward-secrecy with a 2048-bit prime and the P-256 EC curve. See
# http://www.postfix.org/FORWARD_SECRECY_README.html#server_fs
# http://www.postfix.org/postconf.5.html#smtpd_tls_dh1024_param_file
# http://www.postfix.org/postconf.5.html#smtpd_tls_eecdh_grade
#
# The default DH parameters use a 2048-bit strong prime as of Postfix 3.1.0.
#
# man 5 postconf /smtpd_tls_dh1024_param_file
# sudo -u _postfix openssl dhparam -out @PREFIX@/var/lib/postfix/dh512.pem 512
# sudo -u _postfix openssl dhparam -out @PREFIX@/var/lib/postfix/dh2048.pem 1024
# sudo -u _postfix openssl dhparam -out @PREFIX@/var/lib/postfix/dh2048.pem 2048
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_tls_dh1024_param_file=${data_directory}/dh2048.pem
smtpd_tls_eecdh_grade = ultra

# cache incoming and outgoing TLS sessions
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
# man 5 postconf : "for  Postfix  >=  2.11  this parameter  should generally be left empty"
# smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_tlscache
# smtp_tls_session_cache_database  = btree:${data_directory}/smtp_tlscache

# enable SMTPD auth. Dovecot will place an `auth` socket in postfix's
# runtime directory that we will use for authentication.
smtpd_sasl_auth_enable = yes
# Kerberos authentication settings
import_environment="KRB5_KTNAME=@PREFIX@/etc/postfix/smtp.keytab"
# Kerberos REALM
smtpd_sasl_local_domain = @HOST@.@DOMAIN@.@TLD@
# Dovecot SASL
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot

## SASLAUTHD SASL
## smtpd_sasl_path = saslauthd
## smtpd_sasl_type = cyrus

# only allow authentication over TLS
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_tls_auth_only = yes

# don't allow plaintext auth methods on unencrypted connections
# macOS Server v.5.6 configuration:
# smtpd_sasl_security_options = noanonymous
# smtpd_sasl_security_options = noanonymous, noplaintext
# but plaintext auth is fine when using TLS
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_sasl_tls_security_options = noanonymous

# add a message header when email was recieved over TLS
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_tls_received_header = yes

# require that connecting mail servers identify themselves - this greatly
# reduces spam
smtpd_helo_required = yes

# The following block specifies some security restrictions for incoming
# mail. The gist of it is, authenticated users and connections from
# localhost can do anything they want. Random people connecting over the
# internet are treated with more suspicion: they must have a reverse DNS
# entry and present a valid, FQDN HELO hostname. In addition, they can only
# send mail to valid mailboxes on the server, and the sender's domain must
# actually exist.
# macOS Server v.5.6 configuration:
# smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated reject_rbl_client zen.spamhaus.org permit
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_rbl_client, zen.spamhaus.org, permit
# The settings `reject_unknown_reverse_client_hostname, reject_unauth_pipelining` here cause "451 4.3.5 Server configuration error"
# smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_rbl_client, reject_unknown_reverse_client_hostname, reject_unauth_pipelining, zen.spamhaus.org, permit
# you might want to consider:
#  reject_unknown_client_hostname,
# here. This will reject all incoming connections without a reverse DNS
# entry that resolves back to the client's IP address. This is a very
# restrictive check and may reject legitimate mail.
# macOS Server v.5.6 configuration:
# smtpd_helo_restrictions = reject_non_fqdn_helo_hostname reject_invalid_helo_hostname
smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname
# you might want to consider:
#  reject_unknown_helo_hostname,
# here. This will reject all incoming mail without a HELO hostname that
# properly resolves in DNS. This is a somewhat restrictive check and may
# reject legitimate mail
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_sender_domain
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf); but commented out
# #smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, defer_unauth_destination
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated,
# !!! THIS SETTING PREVENTS YOU FROM BEING AN OPEN RELAY !!!
	reject_unauth_destination
# !!!      DO NOT REMOVE IT UNDER ANY CIRCUMSTANCES      !!!
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf); but commented out
# # Added by Server.app>Mail>Filtering Settings... > Enable greylist filtering
# # smtpd_recipient_restrictions = permit_sasl_authenticated reject_unauth_destination check_policy_service unix:private/policy permit
# # SMTP Recipient and Relay Restrictions
# # http://www.postfix.org/SMTPD_ACCESS_README.html
# # https://bbs.archlinux.org/viewtopic.php?id=158020
# # http://superuser.com/questions/664516/noqueue-reject-relay-access-denied
## smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, check_policy_service unix:private/policy permit
# #smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, defer_unauth_destination
# Do *not* use `smtpd_recipient_restrictions = reject_unverified_recipient …`
# if `recipient_delimiter = yes` *and* dovecot-lmtp is used; also see
# dovecot/conf.d/15-lda.conf and dovecot/conf.d/20-lmtp.conf
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unknown_recipient_domain
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
smtpd_data_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_multi_recipient_bounce, reject_unauth_pipelining

# Check:
# sudo bash -c 'port unload postfix ; port unload dovecot2 ; ( cd @PREFIX@/var/log/mail ; > postfix.log ; > mail-err.log ; > mail-debug.log ; > mail-info.log ); port load postfix ; port load dovecot2'
# sudo cp -p /etc/pam.d/dovecot /etc/pam.d/smtp
# sudo mkdir -p @PREFIX@/var/spool/postfix/etc
# sudo touch @PREFIX@/var/spool/postfix/etc/sasldb2
# sudo chgrp mail @PREFIX@/var/spool/postfix/etc/sasldb2
# sudo chmod 0640 @PREFIX@/var/spool/postfix/etc/sasldb2
# gtelnet @host@.@domain@.@tld@ 25
# EHLO @host@.@domain@.@tld@
# AUTH PLAIN `printf "username\000username\000password" | base64`
## Test base64-encoded credentials:
# printf "username\000username\000password" | base64 | openssl based64 -d | od -c

## SASL authentication alone
## sudo touch @PREFIX@/etc/sasldb2
## sudo chgrp mail @PREFIX@/etc/sasldb2
## sudo chmod 0640 @PREFIX@/etc/sasldb2
## sudo saslauthd -a pam
## testsaslauthd -u username -p "password" -s smtp

# Virtual users. Uncomment these after LDAP authentication set up

# deliver mail for virtual users to Dovecot's LMTP socket
# (Not set in /Library/Server_v56/Mail/Config/postfix/main.cf)
virtual_transport = lmtp:unix:private/dovecot-lmtp

# LDAP query to find which domains we accept mail for
#virtual_mailbox_domains = ldap:/usr/local/etc/postfix/ldap-virtual-mailbox-domains.cf
# LDAP query to find which email addresses we accept mail for
#virtual_mailbox_maps = ldap:/usr/local/etc/postfix/ldap-virtual-mailbox-maps.cf, hash:/usr/local/etc/postfix/system-virtual-mailboxes
# LDAP query to find a user's email aliases
#virtual_alias_maps = ldap:/usr/local/etc/postfix/ldap-virtual-alias-maps.cf

# Rspamd milter [email broken_richtext.eml to test]
milter_protocol = 6
# if rspamd is down, don't reject mail
milter_default_action = accept
# Use rspamd's default worker-proxy (add $queue_directory/etc/hosts in chroot)
#smtpd_milters = inet:localhost:11332
# Use rspamd's socket (add $queue_directory@PREFIX@/var/run/rspamd/milter.sock in chroot)
smtpd_milters = unix:@PREFIX@/var/run/rspamd/milter.sock
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}