Author
Alison Gootee
Advocacy Specialist Sinch Mailgun
Latest stories by Alison Gootee
DKIM pass, bounce anyway? Outlook's new mystery rejection
Over the past few weeks, a rising number of Mailgun customers (and industry peers across other ESPs) have encountered bounce messages. In short:
DKIM appears to pass in one place (like Gmail or your DMARC reports) but fails at Microsoft.
And when it fails, Outlook blocks the message, even if it meets standard DMARC policy of p=none...
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