On 18/11/2025 05:05, lejeczek via Postfix-users wrote:
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?
many thanks, L.
https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS
In summary: Your IP address should resolve to $myhostname (via a DNS PTR
record), which in turn should resolve back to your IP (A and/or AAAA
record).
As others have pointed out it may be a temporary DNS error so it is
worthwhile to verify that you have FCRDNS correctly configured but
beyond that I wouldn't worry about it too much.
Peter
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