Forum Discussion
Outlook Deleting Certain Email Before Delivering to my Mailbox (Not Even Going to Junk)
Hi, I've been trying to troubleshoot this issue for 4 months now. I have become aware that since at least May, 2025, there are some emails which are not making it to my mailbox (neither by inbox or ...
If you are not seeing the email in Junk, then it is being blocked at the Microsoft server level and nothing you do with Safe Senders is going to have any impact. They never got to your client.
Microsoft bounces emails for any number of reasons.
https://sendmarc.com/dmarc/microsoft-dmarc-requirements/
They also maintain a Blacklist
https://learn.microsoft.com/en-us/defender-office-365/external-senders-use-the-delist-portal-to-unblock-yourself
You can ask one of the Senders if they got a Non-Deliverable Report, and if so what failed?
Of you can try putting their domain in a check tool. e.g.
https://tools.sendmarc.com/