How to set up Blocked Sender List in Microsoft 365 using OWA (Web logon)?

You can set up Blocked Sender List in your Microsoft 365 (M365) account so that email sent from those email addresses listed in the Blocked Sender List are always filtered to your Junk Email folder.

Following is the setup procedure in Outlook Web App (OWA):

  1. Login Microsoft 365 OWA (Web logon).
  2. Click gear icon at the top-right corner of OWA window.
  3. A pull-down menu like one of the following will appear. Select Options or Mail.


  4. Under Mail and Accounts heading, click Block or allow.
  5. Under Blocked Senders heading, type the email address (e.g. or domain (all email from addresses that end in e.g., then click " + " icon to add the address/domain to the list.
  6. Make sure Automatically filter junk email is selected.
  7. Click Save.


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