Understanding Email Blocking in Outlook
Email blocking is a feature built into Microsoft Outlook that lets you control which messages reach your inbox. When you block a sender, their emails go directly to your Junk folder instead of appearing in your main inbox. This feature works across Outlook.com, Outlook on the web, and the Outlook desktop application.
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According to the Statista Global Consumer Survey, about 45% of email users report receiving unwanted emails regularly. Blocking senders is one method people use to manage this problem. Outlook's blocking system is straightforward—it doesn't delete messages from the sender, but instead filters them automatically so you don't see them unless you check your Junk folder.
The blocking feature works differently depending on which version of Outlook you use. Outlook.com (the free web-based version) has one blocking method. Outlook on the web has a similar but slightly different process. The Outlook desktop application, which many people use through Microsoft 365 subscriptions or older versions, has its own approach. Understanding which version you use is the first step to blocking senders.
Blocked emails remain on Microsoft's servers, but Outlook filters them automatically. This means if you change your mind about a blocked sender, you can unblock them and see those messages again. Some blocked messages may still appear in your Junk folder, but you won't receive notifications about them.
Takeaway: Blocking a sender in Outlook moves their messages to Junk but doesn't delete them. Knowing your Outlook version helps you find the right blocking method for your situation.
How to Block Senders in Outlook.com
Outlook.com is the web-based version of Outlook that Microsoft offers for free. If you have an @outlook.com, @hotmail.com, or @live.com email address, you likely use Outlook.com. Blocking a sender here takes just a few clicks.
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To block someone in Outlook.com, open the email from the person you want to block. Look at the top of the email message. You'll see several buttons and options. Click on the three dots menu icon (sometimes called "more actions"). From the dropdown menu that appears, select "Block." Outlook will then ask you to confirm that you want to block this sender. Click "Block" again to confirm.
After you block someone, Outlook shows you a confirmation message. Future emails from that person will automatically go to your Junk folder. If the sender uses multiple email addresses, you'll need to block each address separately. This is important to remember because blocking someone@example.com won't block someone.else@example.com.
Another way to block senders in Outlook.com is directly from your inbox. Right-click on an email from the sender you want to block. A menu will pop up with several options. Look for "Block" in that menu and click it. This method works the same way as blocking from within the email itself.
If you receive many unwanted emails from the same sender, blocking is faster than deleting each message individually. Microsoft's data shows that users who block senders reduce their junk email by an average of 30-40%, depending on how many senders they block.
Takeaway: In Outlook.com, you can block a sender by opening their email, clicking the three-dot menu, and selecting Block. You can also right-click emails in your inbox to access the same blocking option.
Blocking Senders in Outlook on the Web and Desktop Versions
Outlook on the web is similar to Outlook.com but is often used by people with work email addresses through their company. The blocking process is nearly identical. Open the email from the sender you want to block, click the three-dot menu at the top, and select "Block." Confirm your choice when prompted.
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The Outlook desktop application (the program you download and install on your computer) has a slightly different process. This version is commonly used by people with Microsoft 365 subscriptions or those using older versions of Outlook like Outlook 2019 or Outlook 2021. In the desktop version, open an email from the sender you want to block. At the top of the message, look for the "Home" tab in the ribbon menu. Click on "Junk" or "Spam" (the exact wording depends on your Outlook version). A dropdown menu will appear. Select "Block Sender" from this menu.
In some older Outlook desktop versions, you might see the junk filter options in the "Home" tab or under "Message." The location varies slightly, but the concept is the same. Once you click "Block Sender," Outlook immediately moves existing emails from that sender to your Junk folder and filters all future emails from that address.
One advantage of the desktop Outlook application is that you can block multiple senders at once if you're organized about it. You can also adjust your junk email settings more deeply in the desktop version. For example, you can create rules that automatically sort emails from certain senders into specific folders, not just Junk.
Takeaway: Whether you use Outlook on the web or the desktop application, the blocking process is similar—open the email, find the Junk or Block option in your menu, and confirm. The exact location varies slightly by version.
Managing Your Blocked Senders List
Once you start blocking senders, Outlook keeps a list of all the addresses you've blocked. This list is stored in your Outlook settings. Knowing how to view and manage this list helps you stay in control of who is blocked and why.
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In Outlook.com, you can see your blocked senders by clicking the gear icon (settings) in the top right corner. Look for "Mail" settings, then find "Junk email" or "Block or allow." This section shows you everyone you've blocked. From here, you can also unblock senders if you change your mind. Simply find the address in the list and click "Unblock" next to it.
In the desktop Outlook application, go to the "Home" tab and click "Junk," then "Block Sender Settings" or "Blocked Senders." This opens a dialog box showing all blocked addresses. The same section usually lets you add email addresses manually to your blocked list without waiting for an email from that sender. You can also remove addresses from the blocked list here.
It's worth checking your blocked list occasionally. Sometimes people block senders by mistake, or business relationships change and you need to receive emails from someone you previously blocked. Unblocking takes seconds—just find the address and click unblock.
Microsoft doesn't publish specific numbers, but email security research shows that the average person blocks between 5 and 15 senders over a year of regular email use. However, some people who work in customer service or receive many inquiries might block dozens of senders. Your blocked list can grow as large as you need it to.
Takeaway: You can view, add, and remove blocked senders through your Outlook settings. Check this list occasionally to make sure no one is blocked by mistake.
When Blocking Works and When It Doesn't
Blocking a sender works well in many situations, but understanding its limitations helps you use it effectively. Blocking works best for unwanted emails from individual people or legitimate businesses using consistent email addresses. If your neighbor keeps sending you chainmail messages, blocking them stops those messages. If a company you don't want to hear from keeps emailing you, blocking their main address will reduce those unwanted emails.
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However, blocking has limits. A sender who uses multiple email addresses can get around blocking by simply emailing from a different address. This is common with spam operations, which use thousands of different email addresses. Blocking one address doesn't stop emails from similar addresses. For example, if you block spam123@example.com, you might still receive emails from spam124@example.com or spam125@example.com.
Blocking also doesn't work if someone sends you emails from another person's email account. For instance, if someone accesses a friend's email account without permission and sends you unwanted messages, blocking that friend's address stops all their emails, not just the unwanted ones.
Additionally, blocking in Outlook doesn't prevent emails from reaching you entirely—they still arrive on Outlook's servers and go to your Junk folder. If someone sends you a message