Outlook.com Silent Email Filtering: Legit Emails Not Delivered, No Junk Folder Entry, No NDR

Question

Hello, I’m experiencing a serious issue with Outlook.com silently filtering legitimate incoming emails.

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Issue Summary

Outlook.com is silently dropping certain legitimate emails without:

• Delivering them to Inbox
• Placing them in Junk or Other
• Generating any notification to the recipient
• Returning an NDR/bounce to the sender

This makes the email completely invisible to both the sender and the recipient.

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Example Case

On February 16, 2026 (around 09:00 Beijing Time), a business email from ******@huawei.com was confirmed as successfully sent by the sender’s IT team. However:

• The email never appeared in my Outlook.com mailbox
• It was not in Junk, Deleted, or Other
• The sender received no bounce message
• I have no way to know it was blocked

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Additional Details

I attempted to access the Microsoft 365 Security quarantine page, but Outlook.com (personal account) cannot access it and shows the following error:

Selected user account does not exist in tenant 'Microsoft Services'...

This indicates that Outlook.com users cannot view system-level quarantined or filtered emails.

I have already:

• Added @huawei.com to Safe Senders
• Checked blocked senders
• Reviewed all rules
• Tried Outlook web and app
• Verified with the sender that SPF/DKIM are valid and sending succeeded

Still, the message never arrives.

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Main Concerns

1. Why does Outlook.com silently drop legitimate emails without notifying users?
2. Why can’t Outlook.com users view or control system-level filtering?
3. Is there a way for Outlook.com users to see quarantined/filtered emails?
4. How can I prevent Outlook.com from dropping important business emails?
5. Can Microsoft check whether emails from @huawei.com are being incorrectly filtered or blocked?

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Request for Assistance

I kindly request guidance from the Microsoft team or community experts on:

• How to investigate silent filtering in Outlook.com
• Whether any resolution, whitelist option, or backend adjustment is possible
• How to ensure that important emails are never silently discarded again

This issue affects critical communication, so any help would be greatly appreciated.

Thank you!

Answer 1

There's no way to solve this problem. I noticed it when I first used Outlook in 2019, and it's regrettable to see that Microsoft still has this issue seven years later.There's no way to solve this problem. I noticed it when I first used Outlook in 2019, and it's regrettable to see Microsoft still having this issue seven years later. Your only solution is to switch to a different email address and abandon Outlook.

Answer 2

你遭遇“account does not exist in tenant 'Microsoft Services'”报错，是你在尝试登录，个人Outlook.com邮箱的网页版吗？

https://outlook.com