How to Block Someone on Outlook: Complete Guide to Managing Unwanted Contacts

Whether you're dealing with a persistent spammer, an unwanted contact, or someone whose emails you simply don't want to see, Outlook gives you several ways to block or restrict communication. The method that works best depends on which version of Outlook you're using, what kind of account you have, and how thoroughly you want to filter that person out.

What "Blocking" Actually Does in Outlook

In Outlook, blocking a sender doesn't prevent them from sending you emails — it filters their messages automatically. When you block someone, any future emails from that address are moved directly to your Junk Email folder rather than your inbox. They won't receive a notification that they've been blocked, and their messages aren't deleted outright.

This is an important distinction. Blocking in Outlook is really a junk mail filter rule, not a hard communication wall the way blocking works on social platforms. The emails still arrive on Microsoft's servers — they just get quietly rerouted.

If you want a more aggressive approach (automatic deletion, for example), that requires setting up a separate mail rule, which is covered below.

How to Block Someone in Outlook on the Web (Outlook.com)

This is the most straightforward method and works from any browser. 🖥️

1. Open the email from the person you want to block.
2. Click the three-dot menu (More actions) in the top-right corner of the message.
3. Select Block from the dropdown.
4. Choose Block "[sender name]" in the confirmation prompt.

That's it. Outlook.com immediately adds that address to your Blocked Senders list, and all future emails from that address land in Junk automatically.

To manage your blocked list later, go to Settings → View all Outlook settings → Mail → Junk email → Blocked senders and domains.

How to Block Someone in the Outlook Desktop App (Windows)

The process differs slightly depending on whether you're using the classic Outlook desktop app or the newer Outlook for Windows (the updated version Microsoft has been rolling out).

Classic Outlook desktop app:

1. Right-click on the email from the sender you want to block.
2. Hover over Junk in the context menu.
3. Click Block Sender.

Outlook will move the current email to Junk and add the address to your Blocked Senders list going forward.

New Outlook for Windows:

1. Open or select the email.
2. Click the three-dot menu at the top of the message pane.
3. Select Block → Block [sender name].

Your blocked senders list can be accessed at Settings → Mail → Junk email.

How to Block Someone in Outlook on Mac

In Outlook for Mac, the native blocking feature works similarly but through a slightly different path:

1. Select the email from the sender.
2. Go to the Home tab in the ribbon.
3. Click Junk, then select Block Sender.

The email moves to Junk and the address is logged in your blocked list under Preferences → Email → Junk Mail.

How to Block Someone in Outlook on Mobile (iOS and Android)

Blocking on the mobile app is quick but slightly limited compared to desktop. 📱

1. Open the email from the contact.
2. Tap the three-dot menu (top-right corner).
3. Select Block Sender (or Move to Junk, depending on app version).

The mobile app experience can vary based on whether your account is a personal Microsoft account, a work/school account managed through Microsoft 365, or a third-party email connected to the Outlook app (like Gmail or Yahoo). Work accounts managed by an IT administrator may not offer full blocking controls through the mobile interface.

Setting Up a Rule to Auto-Delete Instead of Junk

If you want emails from a specific sender to be automatically deleted rather than routed to Junk, you'll need a custom mail rule. This is available in Outlook on the web and the desktop app.

In Outlook on the web:

1. Go to Settings → View all Outlook settings → Mail → Rules.
2. Click Add new rule.
3. Set the condition: From → enter the email address.
4. Set the action: Delete (moves to Deleted Items) or Permanently delete.
5. Save the rule.

This gives you more control than the basic block feature, especially useful if you don't want to manually empty your Junk folder regularly.

Key Variables That Affect How Blocking Works

Blocking a Domain, Not Just an Address

If you're receiving spam from multiple addresses at the same domain (like [email protected], [email protected]), you can block the entire domain rather than individual senders.

In Junk email settings (accessible through the web or desktop app), there's a Blocked senders and domains section where you can add a full domain — for example, spamsite.com — so every email from that domain goes to Junk regardless of the specific address.

This is particularly useful for coordinated spam campaigns that cycle through different sender names while keeping the same domain.

The Limits of Outlook's Blocking Tools

Outlook's blocking features are reliable for filtering known addresses, but they have natural limitations. A determined sender can simply use a different email address to reach you again. Blocking works on the address level, not the identity level. For persistent harassment or abuse situations, blocking in the email client is typically just a first step — email providers, employers (for work accounts), or legal channels may need to be involved depending on severity.

How effective blocking is for your situation depends heavily on your specific account setup, how your email environment is managed, and what outcome you're actually trying to achieve.