106 lines
4.2 KiB
CFEngine3
106 lines
4.2 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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# 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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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
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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, check_policy_service unix:private/policyd-spf, reject_unauth_pipelining, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_recipient_domain, reject_rbl_client zen.spamhaus.org
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smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unauth_pipelining
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smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unknown_sender_domain
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disable_vrfy_command = yes
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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 = zen.spamhaus.org*3
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bl.mailspike.net
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b.barracudacentral.org*2
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bl.spameatingmonkey.net
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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_whitelist_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 = yes
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smtpd_sasl_path = /var/spool/postfix/private/auth
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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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# Mail directory
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virtual_transport = lmtp:unix:/var/run/dovecot/lmtp
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virtual_mailbox_domains = /etc/postfix/vhost
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virtual_mailbox_maps = texthash:/etc/postfix/vmailbox
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virtual_alias_maps = texthash:/etc/postfix/virtual
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# Additional option for filtering
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content_filter = smtp-amavis:[127.0.0.1]:10024
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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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dkim_milter = inet:localhost:8891
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dmarc_milter = inet:localhost:8893
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smtpd_milters = $dkim_milter,$dmarc_milter
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non_smtpd_milters = $dkim_milter
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# SPF policy settings
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policyd-spf_time_limit = 3600
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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 reveail our privacy
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smtp_header_checks = pcre:/etc/postfix/maps/sender_header_filter.pcre
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