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###############
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# General
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###############
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# Logging configuration
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maillog_file = /dev/stdout
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# Main domain and hostname
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mydomain = {{ DOMAIN }}
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myhostname = {{ HOSTNAMES.split(",")[0] }}
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myorigin = $mydomain
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# Queue location
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queue_directory = /queue
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# Message size limit
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message_size_limit = {{ MESSAGE_SIZE_LIMIT }}
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# Relayed networks
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mynetworks = 127.0.0.1/32 [::1]/128 {{ SUBNET }} {{ RELAYNETS.split(",") }}
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# Empty alias list to override the configuration variable and disable NIS
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alias_maps =
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# Podop configuration
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podop = socketmap:unix:/tmp/podop.socket:
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# Only accept virtual emails
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mydestination =
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# Relayhost if any is configured
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relayhost = {{ RELAYHOST }}
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{% if RELAYUSER %}
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smtp_sasl_auth_enable = yes
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smtp_sasl_password_maps = lmdb:/etc/postfix/sasl_passwd
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smtp_sasl_security_options = noanonymous, noplaintext
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smtp_sasl_tls_security_options = noanonymous
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{% endif %}
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# Recipient delimiter for extended addresses
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recipient_delimiter = {{ RECIPIENT_DELIMITER }}
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# Only the front server is allowed to perform xclient
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# In kubernetes and Docker swarm, such address cannot be determined using the hostname. Allow for the whole Mailu subnet instead.
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smtpd_authorized_xclient_hosts={{ POD_ADDRESS_RANGE or SUBNET }}
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###############
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# TLS
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###############
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# General TLS configuration
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tls_high_cipherlist = EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA
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tls_preempt_cipherlist = yes
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tls_ssl_options = NO_COMPRESSION, NO_TICKET
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# By default, outgoing TLS is more flexible because
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# 1. not all receiving servers will support TLS,
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# 2. not all will have and up-to-date TLS stack.
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smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
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smtp_tls_protocols =!SSLv2,!SSLv3
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smtp_tls_security_level = {{ OUTBOUND_TLS_LEVEL|default('dane') }}
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smtp_tls_dane_insecure_mx_policy = {{ 'dane' if DEFER_ON_TLS_ERROR else 'may' }}
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smtp_tls_policy_maps=lmdb:/etc/postfix/tls_policy.map, ${podop}dane, socketmap:unix:/tmp/mta-sts.socket:postfix
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smtp_tls_CApath = /etc/ssl/certs
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smtp_tls_session_cache_database = lmdb:/dev/shm/postfix/smtp_scache
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smtpd_tls_session_cache_database = lmdb:/dev/shm/postfix/smtpd_scache
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smtp_host_lookup = dns
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smtp_dns_support_level = dnssec
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delay_warning_time = 5m
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smtp_tls_loglevel = 1
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notify_classes = resource, software, delay
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###############
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# Virtual
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###############
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# The alias map actually returns both aliases and local mailboxes, which is
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# required for reject_unlisted_sender to work properly
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virtual_alias_domains =
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virtual_alias_maps = ${podop}alias
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virtual_mailbox_domains = ${podop}domain
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virtual_mailbox_maps = ${podop}mailbox
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# Mails are transported if required, then forwarded to Dovecot for delivery
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relay_domains = ${podop}transport
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transport_maps = ${podop}transport
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virtual_transport = lmtp:inet:{{ LMTP_ADDRESS }}
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# Sender and recipient canonical maps, mostly for SRS
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sender_canonical_maps = ${podop}sendermap
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sender_canonical_classes = envelope_sender
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recipient_canonical_maps = ${podop}recipientmap
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recipient_canonical_classes= envelope_recipient,header_recipient
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# In order to prevent Postfix from running DNS query, enforce the use of the
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# native DNS stack, that will check /etc/hosts properly.
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lmtp_host_lookup = native
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###############
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# Restrictions
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###############
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# Delay all rejects until all information can be logged
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smtpd_delay_reject = yes
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# Allowed senders are: the user or one of the alias destinations
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smtpd_sender_login_maps = ${podop}senderlogin
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# Restrictions for incoming SMTP, other restrictions are applied in master.cf
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smtpd_helo_required = yes
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check_ratelimit = check_sasl_access ${podop}senderrate
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smtpd_client_restrictions =
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permit_mynetworks,
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check_sender_access ${podop}senderaccess,
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reject_non_fqdn_sender,
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reject_unknown_sender_domain,
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reject_unknown_recipient_domain,
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permit
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smtpd_relay_restrictions =
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permit_mynetworks,
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permit_sasl_authenticated,
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reject_unauth_destination
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unverified_recipient_reject_reason = Address lookup failure
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###############
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# Milter
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###############
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smtpd_milters = inet:{{ ANTISPAM_MILTER_ADDRESS }}
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milter_protocol = 6
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milter_mail_macros = i {mail_addr} {client_addr} {client_name} {auth_authen}
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milter_default_action = tempfail
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###############
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# Extra Settings
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###############
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{# Ensure that the rendered file ends with newline in order to make `postconf` work correctly #}
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{{- "\n" }}
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