sovereign/roles/mailserver/templates/etc_postfix_main.cf.j2

# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Modified as per http://sealedabstract.com/code/nsa-proof-your-e-mail-in-2-hours/

smtpd_banner = $myhostname ESMTP $mail_name
biff = no

# Accept messages up to 50MB
message_size_limit = 51200000

# 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

# antispam
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, reject_invalid_hostname
smtpd_sender_restrictions = reject_unknown_address
disable_vrfy_command = yes
strict_rfc821_envelopes = yes
invalid_hostname_reject_code = 554
multi_recipient_bounce_reject_code = 554
non_fqdn_reject_code = 554
relay_domains_reject_code = 554
unknown_address_reject_code = 554
unknown_client_reject_code = 554
unknown_hostname_reject_code = 554
unknown_local_recipient_reject_code = 554
unknown_relay_recipient_reject_code = 554
unknown_virtual_alias_reject_code = 554
unknown_virtual_mailbox_reject_code = 554
unverified_recipient_reject_code = 554
unverified_sender_reject_code = 554

# TLS parameters
smtpd_tls_mandatory_protocols=!SSLv2,!SSLv3
smtp_tls_mandatory_protocols=!SSLv2,!SSLv3
smtp_tls_protocols = !SSLv2,!SSLv3
smtpd_tls_protocols = !SSLv2,!SSLv3
smtpd_tls_cert_file=/etc/letsencrypt/live/{{ domain }}/fullchain.pem
smtpd_tls_key_file=/etc/letsencrypt/live/{{ domain }}/privkey.pem
smtpd_use_tls=yes
smtpd_tls_auth_only = yes
smtp_tls_security_level = may
smtp_tls_loglevel = 2
smtpd_tls_received_header = yes
smtp_tls_note_starttls_offer = yes
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
# http://www.postfix.org/FORWARD_SECRECY_README.html
smtp_tls_ciphers = medium
smtpd_tls_dh1024_param_file = /etc/ssl/private/dhparam2048.pem

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_security_options = noanonymous

# set to empty value for backwards compatibility
# as per http://www.postfix.org/postconf.5.html#smtpd_relay_restrictions
smtpd_relay_restrictions =

smtpd_recipient_restrictions =
  permit_sasl_authenticated,
  permit_mynetworks,
  reject_unauth_pipelining,
  reject_unauth_destination,
  reject_invalid_hostname,
  reject_non_fqdn_hostname,
  reject_non_fqdn_recipient,
  reject_unknown_recipient_domain,
  check_policy_service inet:127.0.0.1:10023,
  permit

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

myhostname = {{ mail_server_hostname }}
myorigin = $mydomain
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 {{ ' '.join(friendly_networks) }}
#mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all

# dovecot db
virtual_transport = lmtp:unix:private/dovecot-lmtp
mailbox_transport = lmtp:unix:private/dovecot-lmtp

dovecot_destination_recipient_limit = 1
virtual_mailbox_domains = pgsql:/etc/postfix/pgsql-virtual-mailbox-domains.cf
virtual_mailbox_maps = pgsql:/etc/postfix/pgsql-virtual-mailbox-maps.cf
virtual_alias_maps = pgsql:/etc/postfix/pgsql-virtual-alias-maps.cf
local_recipient_maps = $virtual_mailbox_maps

# Milters: OpenDKIM, OpenDMARC, Rspamd
smtpd_milters = inet:127.0.0.1:8891,inet:127.0.0.1:54321,inet:127.0.0.1:9900
non_smtpd_milters = $smtpd_milters
milter_protocol = 6
milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen} {auth_type}
milter_default_action = accept

smtpd_client_restrictions = permit_sasl_authenticated

# Postscreen
postscreen_access_list = permit_mynetworks
postscreen_dnsbl_sites =
  sbl-xbl.spamhaus.org*2
  cbl.abuseat.org*2
  bl.spamcop.net*2
  dnsbl.sorbs.net*1
  spam.spamrats.com*2
postscreen_dnsbl_threshold = 3
postscreen_dnsbl_action = enforce
postscreen_greet_action = enforce

{% if mail_header_privacy == 1 %}
# Remove local client IP from headers
smtp_header_checks = pcre:/etc/postfix/maps/smtp_header_checks.pcre
{% endif %}