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Email Sends blocked by Yahoo and AOL DMARC policy

Knowledge Article Number 000213076

If your Marketing Cloud email Sends use "" or "" as part of the From Address, your messages will likely be blocked by major ISPs due to the Yahoo and AOL DMARC policies.

Prevent email deliverability problems by always using a domain that you own as your From Address. Learn how to improve your email deliverability in our "Choosing the Right From Address" blog post.


Example block SMTP response due to DMARC

The SMTP responses for DMARC blocking aren't always straightforward. Here's an example response (classified as a "Hard Bounce" instead of a "Block Bounce"):

"smtp;554 5.7.9 Message not accepted for policy reasons. See"

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