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enable SASL support for port 25 and combine smtpd_sender_restriction directive

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Jeff Volkenant 2019-01-16 09:58:59 -08:00
parent 244d1dfc0c
commit c1cdd0e43d
1 changed files with 12 additions and 3 deletions
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15
setup/mail-postfix.sh
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@ -185,24 +185,33 @@ tools/editconf.py /etc/postfix/main.cf virtual_transport=lmtp:[127.0.0.1]:10025
#
# * `reject_non_fqdn_sender`: Reject not-nice-looking return paths.
# * `reject_unknown_sender_domain`: Reject return paths with invalid domains.
# * `reject_authenticated_sender_login_mismatch`: Reject if mail FROM address does not match the client SASL login
# * `reject_sender_login_mismatch`: Reject if mail FROM address does not match the client SASL login,
# Also prevents unauthenticated users from sending mail to other local users.
# reject_sender_login_mismatch was an alias for
# reject_authenticated_sender_login_mismatch & reject_unauthenticated_sender_login_mismatch
# * `reject_rhsbl_sender`: Reject return paths that use blacklisted domains.
# * `permit_sasl_authenticated`: Authenticated users (i.e. on port 587) can skip further checks.
# * `permit_mynetworks`: Mail that originates locally can skip further checks.
# * `reject_rbl_client`: Reject connections from IP addresses blacklisted in zen.spamhaus.org
# * `reject_unlisted_recipient`: Although Postfix will reject mail to unknown recipients, it's nicer to reject such mail ahead of greylisting rather than after.
# * `check_policy_service`: Apply greylisting using postgrey.
# * `reject_sender_login_mismatch`: Prevents unauthenticated users from sending mail to other local users.
#
# Notes: #NODOC
# permit_dnswl_client can pass through mail from whitelisted IP addresses, which would be good to put before greylisting #NODOC
# so these IPs get mail delivered quickly. But when an IP is not listed in the permit_dnswl_client list (i.e. it is not #NODOC
# whitelisted) then postfix does a DEFER_IF_REJECT, which results in all "unknown user" sorts of messages turning into #NODOC
# "450 4.7.1 Client host rejected: Service unavailable". This is a retry code, so the mail doesn't properly bounce. #NODOC
tools/editconf.py /etc/postfix/main.cf \
smtpd_sender_restrictions="reject_non_fqdn_sender,reject_unknown_sender_domain,reject_authenticated_sender_login_mismatch,reject_rhsbl_sender dbl.spamhaus.org,reject_sender_login_mismatch" \
smtpd_sender_restrictions="permit_mynetworks,reject_non_fqdn_sender,reject_unknown_sender_domain,reject_sender_login_mismatch,reject_rhsbl_sender dbl.spamhaus.org" \
smtpd_recipient_restrictions=permit_sasl_authenticated,permit_mynetworks,"reject_rbl_client zen.spamhaus.org",reject_unlisted_recipient,"check_policy_service inet:127.0.0.1:10023"
# There was a change from Ubuntu 14.04 to 18.04 with how postfix handles SASL checks.
# smtpd_sasl_auth_enable=yes must be set for reject_sender_login_mismatch
tools/editconf.py /etc/postfix/main.cf \
smtpd_sasl_auth_enable=yes
# Postfix connects to Postgrey on the 127.0.0.1 interface specifically. Ensure that
# Postgrey listens on the same interface (and not IPv6, for instance).
# A lot of legit mail servers try to resend before 300 seconds.