# See /usr/share/postfix/main.cf.dist for a commented, more complete

# version.

# General settings

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

# Internet hostname of this mail system.

myhostname = {{ inventory_hostname }}

# Under Debian, when a file name is specified, the first line of the

# file be used as the SMTP server name.

myorigin = /etc/mailname

# Text shown to connecting clients as part of SMTP greeting.

# Listen on all network interfaces and all protocols.

inet_interfaces = all

inet_protocols = all

# Fall-back to using native lookups (/etc/hosts etc) if DNS lookup

# fails. Useful for local overrides of mail servers.

smtp_host_lookup = dns, native

# Do not append server's domain to locally sent mail. This is up to

# sending MUAs to take care of.

# Recipient delimeter for separating user name from its extension.

recipient_delimiter = +

# Deliver undeliverable bounces to domain's postmaster. Helps with application

# misconfigurations.

notify_classes = resource, software, 2bounce

# Explicitly set maximum allowed mail size that should be accepted.

message_size_limit = {{ mail_message_size_limit }}

# Disable output of Postfix README file paths when invoking postconf.

# Compatibility level for default values. For more details, see:

#     https://www.postfix.org/COMPATIBILITY_README.html

# Local mailbox delivery

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

# List of domains for local transport deliveries.

mydestination = {{ inventory_hostname }}, {{ inventory_hostname_short }}, localhost.localdomain, localhost

# Alias maps for local deliveries (to system accounts).

# Alias database that gets updated when invoking "newaliases" command.

# Disable size limits for local user mailboxes.

# Disable use of biff service for new mail notifications to local

# users (improves performance).

biff = no

# Virtual mailbox delivery

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

# Deliver mails via Dovecot LDA for virtual domains.

virtual_transport = dovecot

# Maximum number of recipients per message delivery.

dovecot_destination_recipient_limit = 1

# Remote mailbox delivery

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

# List of trusted networks allowed to relay mail through this system.

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128{% for network in smtp_allow_relay_from  %} {{ network }}{% endfor %}

# Allow relaying only from trusted networks. Do not relay mails for

# domains for which the mail server is not responsible.

smtpd_relay_restrictions = permit_mynetworks

  reject_unauth_destination

# Do not use relay host for non-local mail delivery (act as proper

# public-facing mail system).

relayhost =

# TLS configuration

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

# Allow connecting SMTP clients to use TLS when connecting to the

# host, but do not enforce it.

# Allow SMTP authentication to proceed only over TLS.

# TLS private key and certificate to use for SMTP server.

# Use custom, generated DH parameters for increased security.

# Use TLS when available with Postfix SMTP client.

# Enable TLS session cache database for SMTP client. Helps with

# performance and bandwidth usage.

smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# Authentication and authorisation

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

# Authenticate users via Dovecot.

smtpd_sasl_type = dovecot

smtpd_sasl_path = private/auth

# Disable authentication by default (for server-to-server

# communications on TCP port 25). Users should connect via submission

# port instead, where authentication is enabled.

smtpd_sasl_auth_enable = no

# Look-up list of SASL login names that are allowed to send mails

# Pass all mails through anti-virus.

# Administrator-provided custom settings

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