> On 1 Oct 2026, at 00:23, Gioele Pannetto via mailop <[email protected]> wrote: > > Hi all, > I was looking into our JMRP/FBL reports and I saw that many reports sent by > Microsoft have failing DKIMs caused by a bad signature. > The reports gets delivered anyway, given outlook.com's DMARC p=none and > passing SPF, but I'm suspecting a bug in our DKIM verifier, since I expect > Microsoft should know how to DKIM sign a message. > > Did anyone else noticed this?
We used to have 2 separate DKIM verifiers on our incoming mail (don’t ask). Microsoft consistently failed at one and passed at the other. So there’s at least one verifier where their signatures don’t interoperate. laura — Demystifying “It Depends...” since 2001 Laura Atkins Word to the Wise [email protected] Delivery hints and commentary: http://www.wordtothewise.com/blog
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