125 lines
5.4 KiB
CFEngine3
125 lines
5.4 KiB
CFEngine3
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
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smtpd_banner = $myhostname ESMTP
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biff = no
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append_dot_mydomain = no
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readme_directory = no
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# Disabled as not compatible with Dovecot
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smtputf8_enable = no
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# Basic configuration
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# myhostname =
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alias_maps = hash:/etc/aliases
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alias_database = hash:/etc/aliases
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# Take the following concerns into consideration if adjusting `mydestination`:
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# https://github.com/docker-mailserver/docker-mailserver/pull/3264#pullrequestreview-1396816109
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# https://github.com/docker-mailserver/docker-mailserver/pull/3264#issuecomment-1518993555
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mydestination = $myhostname, localhost.$mydomain, localhost
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relayhost =
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mynetworks = 127.0.0.0/8 [::1]/128 [fe80::]/64
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mailbox_size_limit = 0
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recipient_delimiter = +
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inet_interfaces = all
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inet_protocols = all
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# TLS parameters
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# These [snakeoil files actually exist](https://askubuntu.com/questions/396120/what-is-the-purpose-of-the-ssl-cert-snakeoil-key), but shouldn't ever be used in production!
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# If no `SSL_TYPE` env is set, "plaintext" is configured, but still accepts SSL with these:
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smtpd_tls_chain_files = /etc/ssl/private/ssl-cert-snakeoil.key /etc/ssl/certs/ssl-cert-snakeoil.pem
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#smtpd_tls_CAfile =
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#smtp_tls_CAfile =
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smtpd_tls_security_level = may
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smtpd_tls_loglevel = 1
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smtp_tls_security_level = may
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smtp_tls_loglevel = 1
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# Reduces CPU overhead with `NO_COMPRESSION`, SMTP not at risk of CRIME attack (see git blame for details)
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# Reduce opportunities for a potential CPU exhaustion attack with `NO_RENEGOTIATION`
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tls_ssl_options = NO_COMPRESSION, NO_RENEGOTIATION
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tls_high_cipherlist = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
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tls_preempt_cipherlist = yes
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smtpd_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
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smtp_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
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smtpd_tls_mandatory_ciphers = high
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smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
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smtpd_tls_exclude_ciphers = aNULL, SEED, CAMELLIA, RSA+AES, SHA1
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smtpd_tls_dh1024_param_file = /etc/postfix/dhparams.pem
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smtpd_tls_CApath = /etc/ssl/certs
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smtp_tls_CApath = /etc/ssl/certs
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# Settings to prevent SPAM early
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smtpd_helo_required = yes
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smtpd_delay_reject = yes
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smtpd_helo_restrictions = permit_mynetworks, reject_invalid_helo_hostname, permit
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smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
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smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_recipient_domain
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smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
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smtpd_sender_restrictions = $dms_smtpd_sender_restrictions
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smtpd_discard_ehlo_keywords = silent-discard, dsn
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smtpd_data_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining
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disable_vrfy_command = yes
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# Security - Prevent SMTP Smuggling attack
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# https://www.postfix.org/smtp-smuggling.html#long
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smtpd_forbid_bare_newline = yes
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# It is possible to exclude clients on trusted networks from this restriction (the upstream default is `$mynetwork`):
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# smtpd_forbid_bare_newline_exclusions = $mynetworks
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# Custom defined parameters for DMS:
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# reject_unknown_sender_domain: https://github.com/docker-mailserver/docker-mailserver/issues/3716#issuecomment-1868033234
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dms_smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unknown_sender_domain
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# Submission ports 587 and 465 support for SPOOF_PROTECTION=1
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mua_sender_restrictions = reject_authenticated_sender_login_mismatch, $dms_smtpd_sender_restrictions
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# Postscreen settings to drop zombies/open relays/spam early
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postscreen_dnsbl_action = enforce
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postscreen_dnsbl_sites =
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zen.spamhaus.org=127.0.0.[2..11]*3
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bl.mailspike.net=127.0.0.[2;14;13;12;11;10]
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b.barracudacentral.org*2
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bl.spameatingmonkey.net=127.0.0.2
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dnsbl.sorbs.net
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psbl.surriel.com
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list.dnswl.org=127.0.[0..255].0*-2
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list.dnswl.org=127.0.[0..255].1*-3
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list.dnswl.org=127.0.[0..255].[2..3]*-4
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postscreen_dnsbl_threshold = 3
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postscreen_dnsbl_allowlist_threshold = -1
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postscreen_greet_action = enforce
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postscreen_bare_newline_action = enforce
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# SASL
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smtpd_sasl_auth_enable = no
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smtpd_sasl_path = /dev/shm/sasl-auth.sock
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smtpd_sasl_type = dovecot
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smtpd_sasl_security_options = noanonymous
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smtpd_sasl_local_domain = $mydomain
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broken_sasl_auth_clients = yes
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# Postfix lookup tables for verifying valid users and managed mail domains:
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# Populated during startup in: scripts/helpers/postfix.sh
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virtual_mailbox_domains = /etc/postfix/vhost
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# Populated during startup in: scripts/helpers/aliases.sh
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virtual_alias_maps = texthash:/etc/postfix/virtual
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# Milters used by DKIM
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milter_protocol = 6
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milter_default_action = accept
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smtpd_milters =
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non_smtpd_milters =
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# Header checks for content inspection on receiving
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header_checks = pcre:/etc/postfix/maps/header_checks.pcre
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# Remove unwanted headers that reveal our privacy
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smtp_header_checks = pcre:/etc/postfix/maps/sender_header_filter.pcre
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# The default compatibility_level is 0 - which retains legacy settings defaults:
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# http://www.postfix.org/COMPATIBILITY_README.html
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# If backwards-compatibility log messages appear, fix them by explicitly adding
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# the legacy or new default value (alternatively raise the compatibility_level)
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compatibility_level = 3.6
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