How to Block a Sender by Email Address in Outlook Mail

An illustration of email being blocked by sender email address.

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Most mail is welcome; some is spam. A few messages are neither junk, though, nor welcome: the newsletter that sends to an address you don't recall and whose mailings you cannot seem to turn off, that mysterious sender who always forwards to about three million people — including you; or the auto-reply you never read that comes from a special address.

Using Outlook Mail on the Web and, you can block these easily and avoid future messages from the senders.

Block a Sender by Email Address in Outlook Mail on the Web

To set up a rule in Outlook Mail on the Web that deletes all messages from a sender and removes all current messages from the same sender, too:

  1. Open a message from the sender you want to block.

  2. Click Sweep in the Outlook Mail toolbar.

    Sweep button in Outlook for Web
  3. Verify that Delete all messages from the Inbox folder and any future messages is selected on the sheet that has appeared.

  4. Click Sweep then OK.

    Delete all messages and Sweep button in Outlook on the web will move all messages from the address or addresses in the current folder (but not in other folders — say, your archiving folder if you are in the Inbox) to the Deleted folder and add the sender or senders to your list of blocked senders.

What Happens to Messages from Blocked Senders

Messages from senders on your blocked senders list will be discarded without notice. Neither you nor the sender will be notified, and the messages will not appear in your Deleted or Junk folders.

Block Domains in Outlook on the web

To have Outlook move to the Trash all messages from any domain:

  1. Click the settings gear icon in Outlook on the web.

  2. Scroll to the bottom and click Mail under the Your app settings section.

    Mail button in Settings for Outlook on the web
  3. Click on Block or Allow in the left-hand pane under Accounts.

    Block or Allow button in Outlook Options
  4. Type the domain you want to block into the Blocked domains section.

    Blocked senders section on Outlook for the web

    For example, if you're receiving unwanted mail from someone at ABC Company, and the domain name on the message is, then you can type into that text box.

  5. Click Add.

  6. Click Save to add the email domain to your blocked list.

Blocking Senders and Domains to Block Spam

Blocking specific senders or domains is not a typically a way to stop junk emails. Spam rarely comes twice from the same address.

To combat spam, it is best to report junk emails that make it to your inbox. This procedure will teach the spam filters to recognize and filter similar messages in the future. You should also report phishing scams.