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fix: remove dead check_policy_service unix:private/policy reference - #4
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smtpd_recipient_restrictions referenced a Postfix policy service named "policy" that Dockerfile never actually defines (only "policyd-spf" is defined via postconf -M). Every RCPT command triggered a "connect to private/policy: Connection refused" warning and a 451 "Server configuration problem" rejection -- breaking mail acceptance entirely, for both the Discourse and CE targets equally (this restriction isn't per-target). Verified locally: built the image, ran it standalone, confirmed a test message is now accepted cleanly (previously rejected with 451). Also drops the equivalent dead reference from the non-DMARC branch, which now falls back to Postfix's own sane default recipient restrictions instead of a config that was always broken.
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Summary
Context
Found while regression-testing the multi-domain rebuild on do-3 — Discourse's mail path (which had been working via the stock upstream image) broke once rebuilt from our fork's freshly-built image. Root cause is unrelated to the CE work itself; this dead reference appears to predate this fork.
Test plan