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Block senders or mark email as junk in or Outlook on the web.

Blocking someone will stop their email coming to your Inbox, and reporting an email as Junk will help improve your experience. 

How to block someone

  1. To block someone, select the messages or senders you want to block.

  2. From the top toolbar, select ... then Block Block sender.

  3. Select OK. The messages you select will be deleted and all future messages will be blocked from your mailbox.


Report email as junk or spam

  1. Select the messages you want to report as junk.

  2. From the top toolbar, select Report Report Junk.


  • If you reported an email as junk by mistake, go to your Junk Email folder, select the message and this time select Report Not Junk.

  • If email is still being sent to your Junk folder in error, read Mail goes to the Junk folder by mistake.

  • Junk email is retained for 30 days before it is automatically deleted.

Other options to help keep junk or spam out of your inbox

Expand a section to learn more

This will block everyone except those in your Safe senders list. Remember to include everyone you want to hear from.

  1. Open your Safe senders and domains and select Add.

  2. Type the email addresses or domains of your contacts and other people you want to add, and press Enter.

  3. Under Filters, select from:

    • Only trust email from addresses in my Safe senders and domains list and Safe mailing lists

    • Block attachments, pictures, and links from anyone not in my Safe senders and domains list

  4. Select Save.

Use this feature to block individuals or organizations.

  1. Open Blocked senders and domains and select Add.

  2. Type the email address or domain that you want to block, and press Enter.

  3. Select Save.


    • To remove someone from a list, select Remove next to the email address or domain.

    • You can have up to 1,024 addresses or domains in the Blocked senders and Safe senders lists. If you want to add more than that, try blocking domains instead of individual email addresses.

Rules can help filter out specific words that repeatedly come from different or hidden email addresses.

  1. Open your Rules and select + Add new rule.

  2. Every rule needs at least three things: a name, a condition, and an action.

    Rules can also contain exceptions to conditions. You can add multiple conditions, actions, and exceptions at each step by choosing Add a conditionAdd an action, and Add an exception. 

    For example, to create a rule that deletes all email with the word "weather" in the subject:
    Name = "Weather"; Condition = Subject includes "Weather"; Action = Delete


    • Rules only work on email in your Inbox.

    • If you don't want any more rules to run after this one does, select the Stop processing more rules check box. For more information, see Stop processing more rules in

    • You can create rules to capture your own email address when used on other websites. Learn more.

  3. Press Save to create your rule.

When you post to a message board, newsgroup, chat room, or other public website, spell out your entire email address, for example, chesterbeane AT outlook DOT com. This way, a person can interpret your address, but the automated programs that spammers use often can't.

Spammers get rich when people buy their "products." Don't reply to spam (even to unsubscribe), buy anything from an unfamiliar business, or agree to hold or transfer money for anyone. Beware of messages that appear to come from Microsoft and that ask for your password or threaten to close your account or expire your password. They're false.

You can greatly reduce your risk from hackers, viruses, and worms if you have a firewall, keep your Windows and Microsoft 365 software up to date, and install antivirus and anti-spyware software (and update all routinely).

If you want to stop receiving newsletters or promotions, you can unsubscribe from your inbox.

  1. In your inbox, select a newsletter or promotional email.

  2. At the top of the reading pane, select Unsubscribe.

    A screenshot of the Unsubscribe button

When you shop online, companies sometimes pre-select check boxes that indicate you agree that it's fine to sell or give your email address to responsible parties. If you don't want to receive email from those companies, make sure you clear the check boxes.

Avoid posting your email address on social networking sites, large Internet directories, or job-posting sites. Don't even post it on your own website, unless you disguise it as described in "Disguise your email address", below.

When you sign up for web-based services such as banking, shopping, or newsletters, carefully read the privacy policy before you reveal your email address so you don't unwittingly agree to share confidential information.

The privacy policy should outline the terms and circumstances regarding if or how the site will share your information. If a website doesn't post a privacy statement, consider taking your business elsewhere.

Related Topics

Block a mail sender in Outlook

Block senders or unblock senders in New Outlook

Safe Senders in

Receiving email from blocked senders in

How to deal with phishing in

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