https://bz.apache.org/SpamAssassin/show_bug.cgi?id=8280

--- Comment #7 from Bill Cole <billc...@apache.org> ---
(In reply to William Herrin from comment #5)
> tcpdumping on my mail server, I see a UDP DNS request going out for TXT
> overdrive.com, a UDP response returning with the truncated flag and no
> followup TCP attempt. 
> 
> Trying with "dig" shows the UDP request, truncated response and then TCP
> request and response.
> 
> It appears that the SPF module is not falling back to TCP on my machine.

The most likely culprit is actually Net::DNS, which has had a large number of
substantial updates in recent years and for which we may well cite an outdated
minimum version. There is also a difference between "Mail::SPF::Query"
(obsolete but supported) and "Mail::SPF" (more robust) so you may want to check
which one of those you're using.

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