[RndTbl] weird DKIM fail

Trevor Cordes trevor at tecnopolis.ca
Thu Oct 27 23:26:07 CDT 2022

On 2022-10-27 Hartmut W Sager wrote:
> One quick thought does come to mind.  Any chance you're using
> 2048-bit DKIM and that Yahoo can only work with 1024-bit DKIM?  I
> encountered that in one of my study cases, where the receiving mail
> system can't verify.2048-bit DKIM.

I emailed you (Hartmut) the headers privately (can do for others who
want to help).

Pretty sure I'm not using 2048-bit, just the default stuff, didn't use
the --bits option (manpage says default is 1k).

On 2022-10-27 Theodore Baschak wrote:
> I really wouldn't be surprised to find out this is a problem on the
> yahoo end. I see tons of complaints about mail delivery to them on
> both the NANOG and mailops list.

This very well could be.  We confirmed the exact same mail send to
gmail passes their dkim.

I just want to make sure I'm covering all the bases on our end to
ensure optimal deliverability.


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