ansible-roles/library/roles/postfix-relay/templates/main.cf.j2

smtpd_banner = $myhostname ESMTP $mail_name
biff = {{ postfix_biff }}

# appending .domain is the MUA's job.
append_dot_mydomain = {{ postfix_append_dot_mydomain }}

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
# Server
{% if letsencrypt_acme_install is defined %}
{% if postfix_use_letsencrypt %}
smtpd_tls_cert_file={{ letsencrypt_acme_certs_dir }}/cert
smtpd_tls_key_file={{ letsencrypt_acme_certs_dir }}/privkey
{% else %}
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
{% endif %}
{% endif %}
{% if letsencrypt_acme_install is not defined %}
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
{% endif %}
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
{% if postfix_relay_server %}
smtpd_tls_security_level = encrypt
smtpd_tls_auth_only = yes
{% endif %}
smtpd_tls_security_level={{ postfix_smtpd_tls_security_level }}
# Client
smtp_tls_security_level = {{ postfix_smtp_tls_security_level }}
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = {{ ansible_fqdn }}
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
{% if domain_name is defined %}
myorigin = {{ domain_name }}
{% else %}
myorigin = {{ ansible_fqdn }}
{% endif %}
mydestination = {{ ansible_fqdn }}, localhost
{% if postfix_use_relay_host %}
relayhost = {{ postfix_relay_host }}:{{ postfix_relay_port }}
{% endif %}
{% if not postfix_relay_server %}
mynetworks = 127.0.0.1
inet_interfaces = localhost
inet_protocols = ipv4
{% endif %}
mailbox_size_limit = 0
message_size_limit = {{ postfix_message_size_limit }}
recipient_delimiter = +
default_destination_concurrency_limit = {{ postfix_default_destination_concurrency_limit }}
{% if postfix_use_sasl_auth %}
smtp_sasl_auth_enable= {{ postfix_smtp_sasl_auth_enable }}
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = {{ postfix_smtp_sasl_security_options }}
smtp_sasl_tls_security_options = {{ postfix_smtp_sasl_tls_security_options }}
smtp_sasl_mechanism_filter = {{ postfix_smtp_sasl_mechanism_filter }}
{% if ansible_distribution_file_variety == "Debian" %}
{% if ansible_distribution_version is version_compare('18.04', '>=') %}
smtpd_relay_restrictions = permit_mynetworks, defer_unauth_destination
{% endif %}
{% endif %}
{% endif %}
{% if postfix_relay_server %}
smtpd_sasl_path = smtpd
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = {{ postfix_smtp_sasl_security_options }}
smtpd_sasl_tls_security_options = {{ postfix_smtp_sasl_tls_security_options }}
smtpd_helo_required = yes
mynetworks = {{ postfix_mynetworks }}
inet_interfaces = {{ postfix_interfaces }}

# Don't talk to mail systems that don't know their own hostname.
smtpd_helo_restrictions = reject_unknown_helo_hostname
# Block clients that speak too early.
smtpd_data_restrictions = reject_unauth_pipelining

# Our internal servers talk to the submission port so they are treated as clients
smtpd_client_restrictions = permit_sasl_authenticated, reject

# Don't accept mail from domains that don't exist.
smtpd_sender_restrictions = reject_unknown_sender_domain

# Relay control: local clients and
# authenticated clients may specify any destination domain.
smtpd_relay_restrictions = permit_sasl_authenticated, reject
{% endif %}
{% if ansible_distribution_file_variety == "Debian" %}
{% if ansible_distribution_version is version_compare('18.04', '>=') %}
compatibility_level=2
{% endif %}
{% endif %}