On 2025-11-17 at 11:05:02 UTC-0500 (Mon, 17 Nov 2025 17:05:02 +0100)
lejeczek via Postfix-users <[email protected]>
is rumored to have said:
Hi guys.
Fortunately it does not happen often - or it might be only me with
little experience - yet it happened to me first time someone said:
...
said: 451 X-Warn: FCrDNS failed (in reply to RCPT TO command)
...
Are there any "tricks &| hacks" you know Postfix offer to remedy this?
This may not be the first time a "FCrDNS" (full-circle reverse DNS)
check has affected your mail, but just the first time anyone has stated
it to you clearly and explicitly.
The fix is: make sure that you have a PTR for your IP address which
resolves to a name that has an A record resolving it back to the same IP
address. Also make sure that the DNS service for both the forward and
reverse records is reliable.
--
Bill Cole
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