[RndTbl] weird DKIM fail

Theodore Baschak theodore at ciscodude.net
Thu Oct 27 08:58:53 CDT 2022

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. 


-----Original Message-----
From: Roundtable <roundtable-bounces at muug.ca> On Behalf Of Trevor Cordes
Sent: October 26, 2022 11:15 PM
To: MUUG RndTbl <roundtable at muug.ca>
Subject: [RndTbl] weird DKIM fail

We're sending email on behalf of other companies with the From: (company) and Sender: (us) set properly.  We have DKIM (domainkeys) setup with opendkim for outgoing mail.  We have the TXT record setup properly.

This setup works for all of our customers.  Except one, and only (so far as we know) with yahoomail.  Same setup for every outgoing email, every company, same everything.  But just these emails just to yahoomail show a DK fail.  All other emails for the other companies to any mail provider show a DK pass.

I checked that the customer domain doesn't have a conflicting DK setup, and they don't.

I'm really baffled.  Makes no sense at all.  Anyone have any ideas?
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