[exim-dev] [Bug 2499] SPF false fail, empty MX lookups over…

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Autor: admin
Data:  
A: exim-dev
Assumpte: [exim-dev] [Bug 2499] SPF false fail, empty MX lookups overwrite previous good ones
https://bugs.exim.org/show_bug.cgi?id=2499

--- Comment #16 from Simon Arlott <bugzilla.exim.simon@???> ---
Please remove the "v=spf1" check entirely and just return the data to libspf2
to process so that it can do it correctly. RFC7208 specifies that this is case
insensitive and it is not for Exim to interpret the data.

Please fix "XXX This might have to return NO_DATA sometimes" too. There are
unresolved bugs in libspf2's DNS handling
(https://github.com/nomis/libspf2/commit/3f4a9476aff7aabc72da03e36893fd4038a62698)
so adding more bugs in Exim is not desirable. DNS lookup failures do not imply
NXDOMAIN and this will incorrectly alter the outcome of the SPF check (e.g.
"a", "mx" or "include" lookup failures will reduce the number of recognised
hosts).

Finally, the error message referring to an "IP address lookup" for TXT records
doesn't make sense.

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