Postfix configuration for a relayhost (MX) / Anti-SPAM-/UCE-settings
smtpd (smtp + daemon) = server = Postfix receives mail from a client
smtp = client = Postfix sends mail to another mailserver
used Ports: 10023/tcp: postgrey
10024/tcp: amavisd-new 10025/tcp: policyd-weight
/etc/postfix/main.cf:
alias_maps = hash:/etc/aliases biff = no broken_sasl_auth_clients = yes canonical_maps = hash:/etc/postfix/canonical #check_sender_access = pcre:/etc/postfix/maps/sender_check command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/lib/postfix debug_peer_level = 2 default_destination_concurrency_limit = 20 defer_transports = disable_dns_lookups = no disable_mime_output_conversion = no disable_vrfy_command = yes freemail_gmail = check_client_access pcre:/etc/postfix/maps/freemail_gmail freemail_gmx = check_client_access pcre:/etc/postfix/maps/freemail_gmx freemail_hotmail = check_client_access pcre:/etc/postfix/maps/freemail_hotmail freemail_msn = check_client_access pcre:/etc/postfix/maps/freemail_msn freemail_webde = check_client_access pcre:/etc/postfix/maps/freemail_webde freemail_yahoo = check_client_access pcre:/etc/postfix/maps/freemail_yahoo html_directory = /usr/share/doc/packages/postfix/html inet_interfaces = all inet_protocols = ipv4 localdomains = /etc/postfix/localdomains local_recipient_maps = proxy:ldap:/etc/postfix/ldap/ldap_local-recipients.cf proxy:unix:passwd.byname $alias_maps mail_name = MX-Server mail_owner = postfix mail_spool_directory = /var/mail mailbox_command = mailbox_size_limit = 0 mailbox_transport = mailq_path = /usr/bin/mailq manpage_directory = /usr/share/man masquerade_classes = envelope_sender, header_sender, header_recipient masquerade_domains = !groupware.$mydomain !haas.$mydomain $mydomain masquerade_exceptions = root message_size_limit = 30000000 mydestination = $mydomain mydomain = example.com myhostname = vw01.example.com mynetworks = 172.16.0.0/16, 172.18.0.0/16, 127.0.0.0/8 mynetworks_style = subnet myorigin = $mydomain newaliases_path = /usr/bin/newaliases local_recipient_maps = proxy:ldap:/etc/postfix/ldap/ldap_local-recipients.cf proxy_read_maps = proxy:ldap:/etc/postfix/ldap/ldap_local-recipients.cf $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/packages/postfix/README_FILES relay_domains = $mydestination relayhost = relocated_maps = hash:/etc/postfix/relocated sample_directory = /usr/share/doc/packages/postfix/samples sender_canonical_maps = hash:/etc/postfix/sender_canonical sendmail_path = /usr/sbin/sendmail setgid_group = maildrop smtp_sasl_auth_enable = no smtp_tls_loglevel = 0 smtp_tls_note_starttls_offer = yes smtp_tls_session_cache_database = sdbm:/etc/postfix/smtp_scache smtp_use_tls = no smtpd_banner = $myhostname ESMTP $mail_name smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_invalid_hostname, check_client_access pcre:/etc/postfix/maps/header_checks, reject_rbl_client zen.spamhaus.org, permit smtpd_data_restrictions = reject_unauth_pipelining smtpd_helo_required = yes smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, regexp:/etc/postfix/maps/helo.regexp reject_invalid_hostname, reject_non_fqdn_hostname, permit smtpd_recipient_restrictions = reject_sender_login_mismatch, permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_invalid_hostname, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_non_fqdn_recipient, reject_unknown_recipient_domain, check_sender_access hash:/etc/postfix/maps/freemail_check, check_recipient_access pcre:/etc/postfix/maps/header_checks, reject_rbl_client relays.ordb.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client opm.blitzed.org, reject_rbl_client list.dsbl.org, reject_rbl_recipient zen.spamhaus.org, reject_rbl_client sbl.spamhaus.org, reject_rbl_client dul.dnsbl.sorbs.net, check_policy_service inet:127.0.0.1:10023 permit smtpd_restriction_classes = freemail_gmail freemail_gmx freemail_hotmail freemail_msn freemail_webde freemail_yahoo smtpd_sasl_auth_enable = no smtpd_sasl_security_options = noanonymous smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unknown_sender_domain, reject_non_fqdn_sender, permit smtpd_tls_ask_ccert = yes smtpd_tls_received_header = yes smtpd_tls_session_cache_database = sdbm:/etc/postfix/smtpd_scache smtpd_use_tls = no strict_8bitmime = no strict_rfc821_envelopes = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport unknown_address_reject_code = 554 unknown_hostname_reject_code = 554 unknown_client_reject_code = 554 virtual_alias_domains = hash:/etc/postfix/virtual virtual_alias_maps = hash:/etc/postfix/virtual
/etc/postfix/master.cf:
smtp inet n - n - - smtpd
-o content_filter=lmtp-amavis:[127.0.0.1]:10024
-o receive_override_options=no_address_mappings
#smtp-amavis unix - - n - 2 smtp
# -o smtp_data_done_timeout=1200
# -o smtp_send_xforward_command=yes
# -o disable_dns_lookups=yes
# -o max_use=20
lmtp-amavis unix - - n - 2 lmtp -v
-o lmtp_data_done_timeout=1200
-o lmtp_send_xforward_command=yes
-o disable_dns_lookups=yes
-o max_use=20
localhost:10025 inet n - n - - smtpd
-o content_filter=
-o local_recipient_maps=
-o relay_recipient_maps=
-o smtpd_restriction_classes=
-o smtpd_deley_reject=no
-o smtpd_client_restrictions=permit_mynetworks,reject
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject_unauth_destination
-o smtpd_data_restrictions=reject_unauth_pipelining
-o smtpd_end_of_data_restrictions=
-o mynetworks=127.0.0.0/8
-o smtpd_error_sleep_time=0
-o smtpd_soft_error_limit=1001
-o smtpd_hard_error_limit=1001
-o smtpd_client_connection_count_limit=0
-o smtpd_client_connection_rate_limit=0
-o receive_override_options=no_header_body_checks,no_unknown_recipient_checks
#submission inet n - n - - smtpd
# -o smtpd_etrn_restrictions=reject
# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes
# -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes
#submission inet n - n - - smtpd
# -o smtpd_etrn_restrictions=reject
# -o smtpd_enforce_tls=yes -o smtpd_sasl_auth_enable=yes
#628 inet n - n - - qmqpd
pickup fifo n - n 60 1 pickup
cleanup unix n - n - 0 cleanup
qmgr fifo n - n 300 1 qmgr
#qmgr fifo n - n 300 1 oqmgr
#tlsmgr unix - - n 1000? 1 tlsmgr
rewrite unix - - n - - trivial-rewrite
bounce unix - - n - 0 bounce
defer unix - - n - 0 bounce
trace unix - - n - 0 bounce
verify unix - - n - 1 verify
flush unix n - n 1000? 0 flush
proxymap unix - - n - - proxymap
smtp unix - - n - - smtp
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay unix - - n - - smtp
-o fallback_relay=
# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq unix n - n - - showq
error unix - - n - - error
discard unix - - n - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - n - - lmtp
anvil unix - - n - 1 anvil
#localhost:10025 inet n - n - - smtpd -o content_filter=
scache unix - - n - 1 scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent. See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
cyrus unix - n n - - pipe
user=cyrus argv=/usr/lib/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient
procmail unix - n n - - pipe
flags=R user=nobody argv=/usr/bin/procmail -t -m /etc/procmailrc ${sender} ${recipient}
/etc/postfix/localdomains.
# put in this file all the domain-names, you're accepting mails for. Each domain on a separate line: domain1.example.com domain2.example.com
/etc/postfix/maps/sender_check: (Adapt to your needs!)
/domain\.de$/ DUNNO /^mail\.domain\.de$/ DUNNO /^spammer\.de$/ REJECT
/etc/postfix/maps/freemail_check:
gmail.com freemail_gmail gmx.net freemail_gmx hotmail.com freemail_hotmail msn.com freemail_msn web.de freemail_webde yahoo.com freemail_yahoo
don't forget to do a postmap /etc/postfix/maps/freemail_check !!!
/etc/postfix/maps/freemail_gmail:
/(^|\.)gmail\.com$/ DUNNO /./ REJECT You claim to be from gmail.com but your mail didn't come from a gmail.com server.
/etc/postfix/maps/freemail_gmx:
/(^|\.)gmx\.net$/ DUNNO /./ REJECT You claim to be from gmx.net but your mail didn't come from a gmx.net server.
/etc/postfix/maps/freemail_hotmail:
/(^|\.)hotmail\.com$/ DUNNO /./ REJECT You claim to be from hotmail.com but your mail didn't come from a hotmail.com server.
/etc/postfix/maps/freemail_msn:
/(^|\.)msn\.com$/ DUNNO /./ REJECT You claim to be from msn.com but your mail didn't come from a msn.com server.
/etc/postfix/maps/freemail_webde:
/(^|\.)web\.de$/ DUNNO /./ REJECT You claim to be from web.de but your mail didn't come from a web.de server.
/etc/postfix/maps/freemail_yahoo:
/(^|\.)yahoo\.com$/ DUNNO /./ REJECT You claim to be from yahoo.com but your mail didn't come from a yahoo.com server.
/etc/postfix/maps/header_checks: (risky!)
/(dsl|dynamic|ppp|dhcp|broadband|cable|dialin|dialup).*..*$/ REJECT Rule #1 No mails from dynamic IPs are allowed.
/[d]{1,3}[-.][d]{1,3}[-.][d]{1,3}[-.][d]{1,3}([D]+)/ REJECT Rule #2 No mails from dynamic IPs are allowed.
/[d]{8,}/ REJECT Rule #3 No mails from dynamic IPs are allowed.
/etc/postfix/maps/helo.regexp :
/^.example\.com$/ 550 Don't use my own hostname
/^171\.16\.68\.170$/ 550 Don't use my own IP address
/^[0-9.]+$/ 550 Your software is not RFC 2821 compliant
/^[0-9]+(\.[0-9]+){3}$/ 550 Your software is not RFC 2821 compliant
This alone will turn away spammers trying to send the helo command and impersonating either the server receiving the mail by IP or by hostname as well as turning away some of the mail that doesn't meet RFC 2821 compliance.
/etc/postfix/ldap/ldap_local-recipients.cf: (if LDAP-tree with recipients resides on another server, e.g. station7.example.com)
server_host= station7.example.com server_port= 389 version= 3 bind= no timeout= 120 search_base= dc=example,dc=com query_filter = (&(objectClass=gosaMailAccount)(gosaMailDeliveryMode=[*L*])(|(mail=%s)(gosaMailAlternateAddress=%s))) result_attribute= uid lookup_wildcards= no scope= sub
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