On Mon, 19 Dec 2022, Carlos Mogas da Silva wrote:

Hi list.

My incoming messages are getting R_SPF_DNSFAIL and an error on the Authentication-Results header:

spf=temperror
(mail01.r3pek.org: error in processing during lookup of
no-re...@cttexpresso.pt: DNS error)

I see the DNS request on my DNS server and a "working" reply going out. What can cause this error and/or how can I debug it?

How (which program) is the SPF check being done?

Dovecot doesn't do that (AFAIK anyway), so maybe you want to check which program (e.g. a postfix milter, such as rspamd) is doing that and check the logs of that program to see what went wrong.

But I'm 99.9% sure this has nothing to do with dovecot :)

Cheers,
Bernardo

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