Postscreen rejecting legitimate Gmail/Outlook on first connection

admin 16 May 2026, 07:00

Postscreen's mandatory deep-protocol test was returning 450 4.3.2 to Gmail and Outlook on first attempt. Sender servers retry and it works the second time, but we're losing some first-attempt mail entirely.

1 comment

Transcom 16 May 2026, 07:30

Bypassed postscreen entirely — master.cf now goes smtp inet → smtpd directly. The DNSBL scoring still works via the body content scoring path, so we don't lose much. Trade is more scanner CPU but zero legit-mail loss.

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