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mailu: harden postfix relay restrictions

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This commit is contained in:
Brad Stein 2026-01-07 02:47:12 -03:00
parent 8749d8a884
commit ef0dfab20c
1 changed files with 6 additions and 2 deletions
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8
services/mailu/helmrelease.yaml
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@ -218,22 +218,26 @@ spec:
hardware: rpi4
overrides:
postfix.cf: |
mynetworks = 127.0.0.0/8 [::1]/128 10.42.0.0/16 10.43.0.0/16 192.168.22.0/24
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname
smtpd_helo_restrictions = reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = noanonymous
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining, reject_unknown_client_hostname
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_non_fqdn_recipient, reject_unknown_recipient_domain
smtpd_relay_restrictions = permit_sasl_authenticated, reject_unauth_destination
smtpd_sender_restrictions = reject_non_fqdn_sender, reject_unknown_sender_domain, reject_sender_login_mismatch, reject_authenticated_sender_login_mismatch
smtpd_tls_auth_only = yes
smtpd_forbid_unauth_pipelining = yes
smtpd_client_connection_count_limit = 20
smtpd_client_connection_rate_limit = 30
smtpd_client_message_rate_limit = 100
smtpd_client_recipient_rate_limit = 200
smtpd_recipient_limit = 100
podAnnotations:
bstein.dev/restarted-at: "2026-01-06T00:00:00Z"
redis: