How to Block a Person on Outlook: A Complete Guide

Unwanted emails are more than annoying — they can be distracting, potentially harmful, or flat-out harassing. Microsoft Outlook gives you several ways to block senders, but the method that works best depends on which version of Outlook you're using and what you actually want to happen to those messages.

What "Blocking" Actually Does in Outlook

When you block a sender in Outlook, their messages are automatically moved to your Junk Email folder rather than your inbox. They aren't notified, and the emails aren't deleted — they're just silently rerouted. This is important to understand because "blocking" in Outlook is not the same as a firewall-level rejection. The messages still arrive at your mail server; Outlook just filters them before you see them.

For most everyday situations — newsletters you didn't sign up for, a persistent former contact, or a low-level nuisance — this works well. For genuinely threatening or abusive messages, you'll want to involve your email administrator or report through official channels, because Outlook's built-in blocking has limits.

How to Block a Sender in Outlook on Desktop (Windows & Mac)

The classic Outlook desktop app — the one installed as part of Microsoft 365 or as a standalone purchase — handles blocking through the Junk Email settings.

Steps:

1. Open the email from the person you want to block.
2. Right-click the message in your inbox.
3. Select Junk from the context menu.
4. Choose Block Sender.

That's it. Outlook adds the sender's email address to your Blocked Senders List, and any future email from that address goes straight to Junk.

To review or manage your blocked list later, go to Home → Junk → Junk Email Options → Blocked Senders. From there you can add addresses manually, remove blocks, or import/export a list.

🛑 Note for Mac users: The steps are nearly identical, but the menu labels may differ slightly depending on your version of the Outlook for Mac app. Look for Junk Mail rather than Junk Email in some older versions.

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

If you access Outlook through a browser at outlook.com or via a Microsoft 365 business account in the browser, the process is slightly different.

Steps:

1. Open the email from the sender you want to block.
2. Click the three-dot menu (⋯) at the top of the message.
3. Select Block → Block sender.
4. Confirm by clicking OK in the dialog box.

Outlook on the web will immediately move that email to your Junk folder and block future messages from the same address. You can manage your blocked list under Settings → Mail → Junk email → Blocked senders and domains.

How to Block a Sender in the New Outlook App (Windows 11)

Microsoft has been rolling out a redesigned New Outlook app that replaces the traditional desktop client on Windows 11. Its interface more closely mirrors Outlook on the web.

Steps:

1. Select the email from the sender.
2. Click the three-dot menu in the reading pane or message list.
3. Choose Block → Block sender.

The behavior is the same — future emails from that address route to Junk. Because the New Outlook app is still being updated regularly, exact menu placement may shift slightly with updates.

How to Block a Sender in Outlook Mobile (iOS & Android) 📱

The Outlook mobile app currently does not have a dedicated "Block Sender" button in the same way the desktop and web versions do. Your options here vary:

• Mark as Junk: Open the email, tap the three-dot menu, and select Move to Junk. This trains the filter and, depending on your account type, may add the sender to your blocked list on the server side.
• Create a rule: If your account supports it (Microsoft 365 and Outlook.com accounts do), you can set up a mail rule through the web interface that applies across all devices, including mobile.

This is one area where your account type matters a lot. A personal Outlook.com account and a corporate Microsoft 365 account have different rule-management capabilities.

Blocked Senders vs. Safe Senders vs. Mail Rules

Outlook offers more than one layer of filtering, and they serve different purposes:

If you're dealing with a sender who uses multiple addresses or a spoofed domain, blocking the entire domain is often more effective than blocking individual addresses. You can do this through the same Junk Email Options → Blocked Senders panel by entering @domain.com instead of a full email address.

Variables That Affect How Blocking Works

Blocking behavior in Outlook isn't uniform — it shifts depending on several factors:

• Account type: Outlook.com (personal), Microsoft 365 (business/enterprise), and Exchange-hosted accounts all have different backend filtering capabilities. Enterprise accounts may have organization-wide rules set by an IT administrator that override personal settings.
• Email client version: Classic Outlook desktop, New Outlook, Outlook on the web, and the mobile app each have slightly different interfaces and, in some cases, different feature availability.
• Operating system: Mac and Windows versions of the Outlook desktop app don't always stay in feature parity.
• Admin permissions: On a managed corporate account, your IT department may restrict your ability to add blocked senders or may handle filtering at the server level before email reaches your inbox at all.

Whether a block applies only to your local client or syncs across all your devices and platforms also depends on whether your account uses server-side rules (which follow the account) or client-side rules (which only apply on one device).

What works seamlessly for a solo user on a personal Outlook.com account may look entirely different — or may require IT involvement — for someone using a Microsoft 365 account managed by an employer.