postfix-main.cf

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

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

readme_directory = no

# TLS parameters
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_use_tls = {{ USE_TLS }}
smtp_tls_security_level = {{ TLS_VERIFY }}
smtp_tls_note_starttls_offer = yes
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
{% if EXT_RELAY_PORT == "465" %}
smtp_tls_wrappermode = yes
{% endif %}

{% if INBOUND_TLS == "yes" %}
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
{% endif %}

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

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = {{ RELAY_HOST_NAME }}
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = {{ RELAY_HOST_NAME }}, localhost
relayhost = {{ EXT_RELAY_HOST }}:{{ EXT_RELAY_PORT }}
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 {{ ACCEPTED_NETWORKS }}
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

{{ RAW_CONFIG }}