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User can't send email with Non-Delivery Report

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User can't send email with Non-Delivery Report

Postby blin » Wed Sep 14, 2016 4:18 pm

Situation: the client uses Microsoft Office 365. One of users can't send email with this message: Your message couldn't be delivered because you weren't recognized as a valid sender. The most common reason for this is that your email address is suspected of sending spam and it's no longer allowed to send messages outside of your organization. Contact your email admin for assistance.

Resolution: please follow this post: How to remove a user from a block list in Office 365 - viewtopic.php?f=1&t=19271 to unblock the account.
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blin
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