https://bz.apache.org/SpamAssassin/show_bug.cgi?id=8021

Bill Cole <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #5 from Bill Cole <[email protected]> ---
(In reply to calaad from comment #4)
[...]
> Problem seems to come from resolver. When i configure public resolver, like
> 1.1.1.1, all works good. Problem only occurs when i use my bind9 local
> resolver. 

That's a serious clue. 

> So, I'm not sure if the problem is related to Spamassassin.  
> 
> Using 
> options {
>     edns-udp-size 4096;
>     max-udp-size 4096;
> };
> 
> in named.conf seems to make it works. 

Confirmed. I obtained a sample from elsewhere, reproduced the error, reproduced
the fix. 

Unvalidated guess: bug/misfeature in Net::DNS disabling TCP fallback. 

Thanks for finding the fix.

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