How to Block Domain in Outlook?

Last Updated on February 27, 2024 by Amit Bansal

To avoid spam and potential malware threats, Outlook allows you to block emails from specific domains.

This ensures that you can still receive emails from trusted sources while blocking unwanted ones.

Here’s a quick guide on how to use this feature to safeguard your inbox.

Instructions in this article apply to Outlook 2019, 2016, 2013, and 2010, as well as Outlook 365 and New Outlook.

Steps to Block Domain in Outlook Application

To effectively combat spam, it’s often necessary to block not just individual email addresses but entire domains, as spammers frequently use multiple addresses with the same domain.

To add a domain to your block list in Outlook, follow these steps:

Click on the Home Tab and select Junk from the Delete section.

Click Junk E-mail Options from the dropdown list.

The junk Email option dialog box appears, click the Blocked sender option:

It’s time to add a Domain name by clicking the ‘Add‘ Button.

It is mandatory to enter the Domain name, in a specific format as mentioned in the example (above image). [, or].

I’ve encountered issues with frequently receiving emails from Despite blocking several individual email addresses from MagicBricks, the problem persisted. However, once I blocked the entire domain, all email messages from MagicBricks were successfully blocked.

Then click OK to close the Junk E-mail Options dialog. When you receive emails from the blocked domains, the emails will be considered junk emails.

Import List of Domains to Block List:

If you need to add multiple domains to the block sender list, the previously mentioned method might not be the most efficient. Instead, you should consider exporting the list of domains. Here’s how this process works:

Once you open Junk Email Options or use Direct Keyboard Shortcut Alt HJO.

Select the Blocked Senders tab from above and now click on Import from file:

To block multiple domains in Outlook, you can import a prepared text file containing the domains you wish to block.

If you don’t already have a file, create a text-only file listing all the domains you want to block, and then import this file into the Outlook application.

All the domains listed in the Text file will be imported directly to the Blocked sender list“.

Simply click “OK” to close the files. From now on, any email received from an address with a blocked domain will be automatically blocked by Outlook.

How to Remove Blocked Domain from Outlook Application?

After a while, some users realize that the entire emails received from that domain are blocked, in case you need to unblock the domain or allow Outlook to pass emails from a specific email address of the same blocked domain, here is the solution:

  • Unblock the Domain.
  • Add the Specific email address of that domain into the Whitelist [Safe sender List].

To Open your “Blocked sender List

Open Outlook >> Click Home Tab >> Select Junk from the Delete section >> Click Junk Email Options >> from Junk email options >> Click Block senders.

Select the domain name listed you want to unblock, or you can use the Ctrl + Mouse left button to select multiple domain names and click Remove.

Click OK to close, and now the emails will easily land in your inbox.

Apart from this, you can allow Specific email addresses from your blocked domain, without unblocking the domain.

Here comes the Whitelist (safe sender list) which permits
those emails specified in the whitelist to reach your inbox folder.

How to Block a Domain in Outlook Web?

Blocking domains in Outlook Web is simple. Once you enter a domain into the Block Sender list, Outlook will block any emails from that domain from ever hitting your inbox.

In addition to blocking domains, you can also add domains to the Contact List. When an email arrives from one of these contacts, it will end up in your Junk folder instead of your inbox.

Follow the steps to block the domain in Outlook Web:

Step 1: Open Outlook Web (

Step 2: Click on the settings, gear icon on the top right corner of the screen.

Step 3: Select View all Outlook settings.

Step 4: Select Mail from the left navigation section >> click on Junk email from the extended section.

Step 5: Under the Block Senders and Domain section, click Add.

Step 6: Enter the domain name, you like to block for future incoming emails. [for instance, if you need to block, enter].

Step 7: Click Save and the domain is added to your blocked list. From now onwards when you get an email from that domain, it’s automatically diverted to your Junk Email folder.

Step 8: Close the Settings dialog box

Outlook Web won’t allow users to import files that consist of multiple domain names, as we have learned in the Outlook application.

Remove Blocked Domain from Outlook Web

In case you need to remove the domain from the blocked list, follow the steps up to Step 4 from the above method, and click the delete button in front of the domain name to remove the domain from the blocked domain list.

In case of multiple domains are added to the list and you like to remove more than one from the list you have to click the delete button one by one available in front of every domain name.

Final Words

In summary, Outlook blocks only specific domains to prevent spam, phishing, and malware from reaching users. For example, Outlook blocks domains that have been identified as spam sources.

A blocked domain is added to Outlook’s legitimate and blocked senders list. Any messages you receive from the blocked domain are marked as junk.

You can unblock a domain in Outlook but doing so blocks all messages you receive from the blocked domain as well.

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Amit Bansal

Hello, my name is Amit Kumar Bansal, and I am the founder of Through this blog, I focus on Microsoft Outlook, offering insightful and informative content. Additionally, I produce educational videos on YouTube to further enhance the understanding of my audience. visit my YouTube Channel

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