Forum Discussion
How to Block onmicrosoft.com in Outlook classic on Windows 11?
How can you permanently block 'onmicrosoft.com' emails for Outlook classic on Windows 11 (personal - MS365)?
I am tired of and disgusted at the amount of phishing/spam/malware emails that come in via onmicrosoft.com on behalf of some other entity.
All of the emails are of this category. And supposedly they are from Costco, Home Depot, Lowes, United Health, Sam's Club, cloud storage, protection (Norton), etc.
I have accounts at these big box stores and regularly receive marketing emails directly from these companies - AND - these stores actually know my account name and use it in the email. Whereas the emails from onmicrosoft.com do not. These us no name (and some no email address) to tell me my account is in trouble of expiring, out of space, payment past due, or infected - total BS.
I understand that new domains get created daily and that much of these are difficult to prove validity initially. However, since Microsoft is in a tough situation to know validity or not, give us a way to block, turn off, make a rule, to block emails from onmicrosoft.com so that my Junk mail is not saturated with these bogus emails.
Rules will not work. You cannot create one that blocks and/or automatically deletes emails from onmicrosoft.com.
Report does not work either as the ones reported on keep showing up day after day. If Microsoft's position is that it produces superior products, then it should provide a way for the user to turn off features not needed or desired. 'onmicrosoft.com' is one of the worst product enhancements to come along.
Hoping for a solution.
1 Reply
hi SimplyHuman I understand the frustration, but unfortunately there isn't a built-in option in Outlook to block all emails from onmicrosoft.com.
The challenge is that onmicrosoft.com is Microsoft's default domain for Microsoft 365 tenants, and many legitimate organizations use it for mail routing or administrative purposes. Blocking the entire domain globally could also block valid emails.
If Outlook rules aren't matching these messages, it's often because the visible "From" address differs from the actual sender or return-path. One thing you could try is creating a rule based on the message headers or Internet Message Header if the onmicrosoft.com domain consistently appears there.
If you're using Outlook.com or a Microsoft 365 personal account, your filtering options are fairly limited compared to Exchange Online, where mail flow rules can block domains at the server level.
It would certainly be a useful enhancement if Microsoft allowed users to block specific sender domains like onmicrosoft.com at the mailbox level. You're probably not the only one who would find that feature valuable.
