https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7265

--- Comment #9 from Mark Martinec <[email protected]> ---
> - Net::DNS 1.03 has a bug in that it sends a barrage of queries
>   up to a retry count in one go, with a timeout of 0, so it
>   depends on a luck and a DNS resolver's cache whether a reply
>   is received in a few milliseconds or not - which is why a dkim
>   test fails more likely then not. This bug is still undocumented.

Actually perhaps not a bug, but a change in semantics
of "retry" and "retrans" options with Net::DNS 1.03,
which caused the failure of DNS lookups by a DKIM plugin. 

Now documented at [rt.cpan.org #109183] :

  https://rt.cpan.org/Ticket/Display.html?id=109183

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