Why are my emails marked as 'Unverified' despite having SPF, DKIM, and DMARC set up?
Asked by
CuriousCat84
I'm using Microsoft Exchange Online and have correctly configured SPF, DKIM, and DMARC records. However, one user intermittently has their emails marked as 'Unverified', and this happens whether they're sending to internal or external recipients. I checked the headers of one of these emails and saw that it states 'dmarc=fail (p=none sp=none pct=100) action=none header.from=my_domain.org; dkim=none (message not signed)'. This affected user is on a MacBook Pro using the default Apple Mail app, which other users also use without issue. Intriguingly, this user is the only one that uses Adobe Acrobat Pro. I'm wondering where I should start troubleshooting this problem—could it be related to a digital signature he's created in Adobe?
Answers
It sounds like there's an issue with how that digital signature is set up in Adobe. Sometimes, when a signature is incorrectly configured, it can cause problems with email verification. Have you tried disabling the signature temporarily to see if that changes how the emails are received?
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Check out DMARC Tester—it can provide insights into where things might be going wrong. Just send an email to the address listed on their site or paste in the email headers for a breakdown. It might shed some light on the issue.
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Make sure the sending IP matches the SPF record. If it points to an Amazon IP instead of Microsoft, it won't pass SPF checks. That could definitely cause the 'Unverified' status.
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If you're not using a hybrid setup and everything is online only, then routing shouldn't be an issue. However, some third-party applications might still interfere with how mail is sent. Have you checked if this user is using any other email app alongside Apple Mail?
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