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###############
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# General
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###############
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# Main domain and hostname
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mydomain = {{ DOMAIN }}
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myhostname = {{ HOSTNAME }}
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myorigin = $mydomain
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# Message size limit
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message_size_limit = {{ MESSAGE_SIZE_LIMIT }}
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# Relayed networks
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mynetworks = 127.0.0.1/32 [::1]/128 {{ RELAYNETS }}
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# Empty alias list to override the configuration variable and disable NIS
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alias_maps =
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# SQLite configuration
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sql = sqlite:${config_directory}/
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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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###############
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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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# Only one key/certificate pair is used, SNI not being supported by all
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# services and not a strong requirement. Also, TLS is enforced for submission
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# and smtps in master.cf.
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smtpd_tls_security_level = may
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smtpd_tls_cert_file=/certs/cert.pem
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smtpd_tls_key_file=/certs/key.pem
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smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
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# Server-side TLS is hardened, it should be up to the client to update his or
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# her TLS stack in order to connect to the mail server. Hardening is based on
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# https://bettercrypto.org/static/applied-crypto-hardening.pdf
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smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
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smtpd_tls_protocols = !SSLv2, !SSLv3
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smtpd_tls_ciphers = high
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smtpd_tls_mandatory_ciphers = high
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# Outgoing TLS is more flexible because 1. not all receiving servers will
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# support TLS, 2. not all will have and up-to-date TLS stack.
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smtp_tls_security_level = may
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smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
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smtp_tls_protocols =!SSLv2,!SSLv3
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smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
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# General TLS hardening
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tls_ssl_options = NO_COMPRESSION
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tls_preempt_cipherlist = yes
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###############
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# SASL
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###############
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smtpd_sasl_local_domain = $myhostname
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# Authentication is done against dovecot, which acts as the main authention
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# source
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smtpd_sasl_type = dovecot
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smtpd_sasl_path = inet:imap:2102
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smtpd_sasl_auth_enable = yes
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smtpd_sasl_security_options = noanonymous
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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_maps = ${sql}sqlite-virtual_alias_maps.cf
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virtual_mailbox_domains = ${sql}sqlite-virtual_mailbox_domains.cf
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virtual_mailbox_maps = $virtual_alias_maps
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# Mails are forwarded to Dovecot for delivery
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virtual_transport = lmtp:inet:imap:2525
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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 = $virtual_alias_maps
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# Helo restrictions are specified for smtp only in master.cf
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smtpd_helo_required = yes
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# Sender restrictions
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smtpd_sender_restrictions =
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permit_mynetworks,
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reject_non_fqdn_sender,
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reject_unknown_sender_domain,
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reject_unlisted_sender,
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reject_sender_login_mismatch,
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permit
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# Recipient restrictions:
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smtpd_recipient_restrictions =
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reject_unauth_pipelining,
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reject_non_fqdn_recipient,
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reject_unknown_recipient_domain,
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permit_mynetworks,
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permit
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###############
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# Milter
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###############
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smtpd_milters = inet:milter:9900
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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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