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If you want to prevent messages from specific email addresses or domains from reaching your inbox, you can do so. Adding an email address or domain to your blocked sender’s list causes messages from that sender to be automatically routed to the Junk Email folder in Outlook on the web.

Please keep in mind that you can have up to 1,024 addresses or domains in your blocked senders and safe senders lists at any given time. You could also try blocking domains instead of individual email addresses if you want to add even more security measures.

If the instructions do not match what you see, you may be using an older version of Outlook on the web. Please note: On the web, you can find instructions for using classic Outlook.

Senders will be prevented from sending you emails.
Alternatively, if you’re receiving unsolicited emails, you can block the email addresses and domains from which you don’t want to receive messages. Add any email address or domain to your blocked sender’s list to ensure that these messages are delivered to your Junk Email folder instead of your main inbox.

Please keep in mind that emails are automatically deleted from the Junk Email folder after 14 days and cannot be recovered after that time. View the help topic Recover deleted email messages in Outlook on the web for more information.

Select the SettingsSettings button > View all Outlook settings from the drop-down menu.

Select Mail > Junk email from the drop-down menu.

A screenshot of the Settings menu, with the option for Junk email highlighted.

If you want to block a specific email address, enter the address in the Blocked sender’s field and click the Add button. For example, if you want to block all emails from a particular website, enter that website’s domain name into the Blocked Domains field and click Add.

A screenshot of the box that lists the blocked senders

Select the Save option.

Unblock the senders who have been blocked.
Follow the steps outlined below if you want to remove someone from your list of blocked senders.

Select the SettingsSettings button > View all Outlook settings from the drop-down menu.

Select Mail > Junk email from the drop-down menu.

A screenshot of the Settings menu, with the option for Junk email highlighted.

Remove the block from the address or domain you want to unblock by selecting it and pressing Remove.

Prevent emails from being delivered to your Junk Email folder.
Sometimes you don’t want messages from a specific person or domain to end up in your Junk Email folder, and this is one of those times. It will not be necessary to move messages from addresses or domains that are on the safe sender’s list to your Junk Email folder.

Select the SettingsSettings button > View all Outlook settings from the drop-down menu.

Select Mail > Junk email from the drop-down menu.

A screenshot of the Settings menu, with the option for Junk email highlighted.

Enter the email address or domain you want to add to the safe sender’s list in the appropriate field and click Add.

The safe sender’s box as seen on a computer screen

Select the Save option.

Tips:

Click on the item in the list and then click on the Edit or Remove button to make changes to or remove email addresses or domains from your blocked senders and safe senders lists.

To empty your Junk Email folder, go to the left pane and select Junk Email from the list. Select Delete All from the drop-down menu at the top of the screen.

On the web, you can find instructions for using classic Outlook.
Senders will be prevented from sending you emails.
Alternatively, if you’re receiving unsolicited emails, you can block the email addresses and domains from which you don’t want to receive messages. Add any email address or domain to your blocked sender’s list to ensure that these messages are delivered to your Junk Email folder instead of your main inbox.

Please keep in mind that emails are automatically deleted from the Junk Email folder after 14 days and are not retrievable. View the help topic Recover deleted email messages in Outlook on the web for more information.

Navigate to the Settings menu.

Mail can be found at the bottom of the window.

Select Mail > Accounts > Block or allow from the left-hand navigation pane.

Enter the email address or domain that you want to block under Blocked Senders and then click on the Add icon to save your changes.

A screenshot of the Blocked Senders box on the computer screen.

Save your work by clicking on the Save button.

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Evangeline Christina is a Cyber Security Enthusiast, Security Blogger, Technical Editor, Certified Ethical Hacker, Author at Cyberspecial.net. Previously, he worked as a security news reporter in a reputed news agency.