Viktor Dukhovni via Postfix-users:
> On Mon, Nov 17, 2025 at 05:05:02PM +0100, lejeczek via Postfix-users wrote:
>
> > 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.
>
> No tricks. If your DNS is dodgy fix your DNS. Otherwise, if their DNS
> is dodgy, and you don't have a responsive support contact there, their
> problem, nothing you can do about it.
>
> And do keep in mind that DNS lookups sometimes fail because networks are
> unreliable, or some server is overloaded, or .... Ideally rarely and
> intermittently.
Note that the reply code is 4XX (try again later), so they admit
that the DNS lookup may have failed with 'no reply received' error.
Wietse
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