roles/server/mail/postfix/files/default/main.cf

   1 #
   2 ################################################
   3 ### Managed by someone's ansible provisioner ###
   4 ################################################
   5 # Part of: https://git.somenet.org/root/pub/somesible.git
   6 # 2017-2024 by someone <someone@somenet.org>
   7 #
   8
   9 # Last time we extensively looked at our configuration.
  10 compatibility_level=3.6
  11
  12
  13 myhostname = mail.somenet.org
  14 myorigin = mail.l
  15 mydestination = mail.l, l, localhost, localhost.localdomain
  16 mynetworks = 10.0.0.0/8 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
  17
  18
  19 # incoming mail
  20 smtpd_tls_cert_file = /etc/ssl/letsencrypt/mail.somenet.org/fullchain.pem
  21 smtpd_tls_key_file = /etc/ssl/letsencrypt/mail.somenet.org/privkey.pem
  22 smtpd_tls_security_level = may
  23 smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
  24 smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
  25 smtpd_tls_ciphers = high
  26 smtpd_tls_mandatory_ciphers = high
  27 smtpd_tls_loglevel = 1
  28 smtpd_tls_received_header = yes
  29 smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
  30 smtpd_tls_auth_only = yes
  31 # we override this for the "submission" service.
  32 smtpd_sasl_auth_enable = no
  33 smtpd_sasl_path = smtpd
  34 smtpd_banner = $myhostname ESMTP $mail_name
  35 smtpd_helo_required = yes
  36 # fuck sec consult and their business "ethics".
  37 smtpd_forbid_bare_newline = yes
  38 smtpd_forbid_unauth_pipelining = yes
  39 smtpd_discard_ehlo_keywords = chunking, silent-discard
  40
  41
  42 # header cleanup + transport mapping
  43 header_checks = regexp:/etc/postfix/header_checks_in.regexp
  44 nested_header_checks =
  45 transport_maps = hash:/etc/postfix/transport.map
  46 #, hash:/var/lib/sympa/transport.map
  47
  48
  49 # outgoing mail
  50 smtp_tls_security_level = may
  51 smtp_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
  52 smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
  53 smtp_tls_ciphers = high
  54 smtp_tls_mandatory_ciphers = high
  55 smtp_tls_loglevel = 1
  56 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
  57 smtp_header_checks = regexp:/etc/postfix/header_checks_out.regexp
  58
  59
  60 # hosted domains
  61 virtual_alias_domains = somenet.org
  62 virtual_alias_maps = hash:/etc/postfix/virtual.map
  63
  64
  65 # local delivery
  66 mailbox_transport = lmtp:unix:/var/lib/cyrus/socket/lmtp
  67 mailbox_size_limit = 209715200
  68
  69
  70 #sympa
  71 # todo: flip vmailbox und valias domains?
  72 #virtual_mailbox_domains = lists.somenet.org
  73 #virtual_mailbox_maps = hash:/etc/postfix/virtual.map, hash:/etc/postfix/transport.map, hash:/var/lib/sympa/transport.map
  74
  75
  76 # random settings
  77 tls_preempt_cipherlist = yes
  78 biff = no
  79 connection_cache_status_update_time = 3600
  80 inet_protocols=ipv4
  81 message_size_limit = $mailbox_size_limit
  82 recipient_delimiter = +
  83
  84
  85 # take it easy.
  86 default_destination_concurrency_limit = 2
  87
  88 # disable smtputf8 because of cyrus
  89 smtputf8_enable = no
  90
  91
  92 #########################################
  93 # DONT BE AN OPEN RELAY. RESTRICT STUFF #
  94 #########################################
  95 smtpd_restriction_classes = HOLD_OK
  96 HOLD_OK = check_client_access static:hold, permit
  97
  98
  99 # 1. check every incomming connecting.
 100 # we use master.cf to overridden this for the "submission" service to always require authentication:
 101 #   smtpd_client_restrictions = permit_sasl_authenticated, reject
 102 # we merge that into recipient and relay restrictions - no need to check everything multiple times.
 103 #smtpd_client_restrictions =
 104 #    permit_mynetworks,
 105 #    permit_sasl_authenticated,
 106 #    reject_unknown_client_hostname,
 107 #    permit
 108
 109
 110 # 2. check the helo of the incomming connection.
 111 # we merge that into recipient and relay restrictions - no need to check everything multiple times.
 112 # smtpd_helo_restrictions =
 113 #    permit_mynetworks,
 114 #    permit_sasl_authenticated,
 115 #    reject_invalid_helo_hostname,
 116 #    reject_unknown_helo_hostname,
 117 #    permit
 118
 119
 120 # 3. checks run after a connection issues "MAIL FROM"
 121 # we merge that into recipient and relay restrictions - no need to check everything multiple times.
 122 # smtpd_sender_restrictions =
 123 #    check_sender_access regexp:/etc/postfix/sender_restrictions.regexp,
 124 #    permit_mynetworks,
 125 #    permit_sasl_authenticated,
 126 #    reject_non_fqdn_sender,
 127 #    reject_unknown_sender_domain,
 128 #    permit
 129
 130
 131 # 4a. checks run after a connection issues "RCPT TO"
 132 smtpd_recipient_restrictions =
 133     check_sender_access    regexp:/etc/postfix/rcpt_sender.regexp,
 134     check_recipient_access regexp:/etc/postfix/rcpt_recipient.regexp,
 135     permit_mynetworks,
 136     permit_sasl_authenticated,
 137     reject_invalid_helo_hostname,
 138     reject_unauth_pipelining,
 139     reject_unauth_destination,
 140     reject_non_fqdn_sender,
 141     reject_non_fqdn_recipient,
 142     reject_unknown_client_hostname,
 143     reject_unknown_helo_hostname,
 144     reject_unknown_sender_domain,
 145     reject_unknown_recipient_domain,
 146     permit
 147
 148
 149 # 4b. same as smtpd_recipient_restrictions but diffrent.
 150 # needed for spamming astra
 151 smtpd_relay_restrictions =
 152     check_sender_access    regexp:/etc/postfix/rel_sender.regexp,
 153     check_recipient_access regexp:/etc/postfix/rel_recipient.regexp,
 154     check_sender_access    regexp:/etc/postfix/rcpt_sender.regexp,
 155     check_recipient_access regexp:/etc/postfix/rcpt_recipient.regexp,
 156     permit_mynetworks,
 157     permit_sasl_authenticated,
 158     reject_invalid_helo_hostname,
 159     reject_unauth_pipelining,
 160     reject_unauth_destination,
 161     reject_non_fqdn_sender,
 162     reject_non_fqdn_recipient,
 163     reject_unknown_client_hostname,
 164     reject_unknown_helo_hostname,
 165     reject_unknown_sender_domain,
 166     reject_unknown_recipient_domain,
 167     permit
 168
 169
 170 # 5. checks run after a connection issues "RCPT TO"
 171 # we merge that into recipient and relay restrictions - no need to check everything multiple times.
 172 # smtpd_data_restrictions =
 173 #    permit_mynetworks,
 174 #    permit_sasl_authenticated,
 175 #    reject_unauth_pipelining,
 176 #    permit