How to Block Email Address in Outlook?

Do you know unwanted emails are one of the biggest productivity killers today and because of this people keep asking how to block email address in outlook? From daily promotional emails to repeated phishing attempts your overcrowded inbox makes it difficult to find messages that actually matter for you.

If you are wondering how can I block unwanted emails in Outlook well the good news is that Microsoft Outlook provides multiple built in options to stop unwanted senders across desktop, web, and mobile versions.

In this guide you will learn all the working methods to block email address in outlook correctly, based on my real usage, recent testing, and practical scenarios that Outlook users are facing in 2026.

Why Blocking Unwanted Emails in Outlook Is Necessary

Blocking unwanted emails is not just about keeping your inbox clean but In my recent tests across Outlook desktop and Outlook 365 accounts I found repeated spam emails cluttered my inbox but also slowed search performance and increased the risk of accidental phishing clicks.

Below you can find the common reasons users are choosing to block emails:

• Repeated promotional or marketing emails
• Phishing or scam messages
• Emails from unknown or suspicious senders
• Internal misuse of email accounts
• Inbox overload affecting productivity

So understanding how to block email address in outlook helps you ensure that these unwanted emails should stop at the mailbox level instead of being manually deleted every day as time matters the most.

How to Block Email Address in Outlook – Step by Step Guide

The process is quite simple to block an email as sender differs slightly depending on whether you are using Outlook on desktop or web or on your mobile device you can check below a clear platform wise explanation.

Blocking Emails in Outlook on Desktop for Windows & Mac

Let me tell you this method works well for Outlook 2019, 2021, and Microsoft 365 desktop editions now you just need to perform the following steps:

1. Just Open Outlook and go to your inbox
2. Locate the email from the sender you want to block
3. Next Right click on the email
4. Select Junk and Block Sender
5. Now Confirm the action

So after implementing above all steps and blocking sender you will notice that all incoming emails from that sender will automatically go to your junk folder. In my testing this method successfully filtered out over 90% of spam emails from a single sender.

So this is one of the most direct ways to understand how to block email address in Outlook for desktop and macOS Users users.

Block Email Address in Outlook 365 – Web Version

If you use Outlook through a browser the thing for you to note is that the blocking works at the server level and is synchronized between devices. You can check below the working steps

1. Log in to your Outlook account using browser
2. You can open the unwanted email
3. Click the three dots or More actions in the top right corner
4. Now select Block and Block sender
5. Lastly confirm your choice

Following all the above steps will let you block emails from that sender and you will not receive any further email from the unwanted contact. This method is very useful for users who manage multiple devices under a single account.

Block Email Address in Outlook App – Option for Android & iOS

Blocking unwanted emails on mobile is just as important as on desktop so check how you can block by following the steps mentioned below

1. Open the Outlook app
2. Tap the email from the sender you want to block
3. Tap the three dots in the upper corner
4. Select Block sender or Move to Junk

In my recent testing on Android 14 and iOS 17 I found that blocked senders were filtered immediately even if the emails were resent within a few minutes.

If you are a smart phone user and using your device daily you must understand how to block email address in outlook using the mobile app that prevents spam from following you everywhere.

3 Simple Ways to Manage Blocked Senders in Outlook

I believe that blocking emails is not a one time task so managing your blocked senders list is equally important.

If you want to View Blocked Senders List in Outlook just follow the steps mentioned below

1. Go to Home – Junk – Junk Email Options
2. Now you need to open the Blocked Senders tab
3. You can review all blocked email IDs and domains

This helps you ensure all your important contact lists are not accidentally blocked.

How to Unblock a Sender in Outlook

Blocking unwanted emails in Outlook is ok but what if you have blocked any important email contact by mistake? There you need steps how you can unblock that email and for this you just have to follow the simple 3 steps that are:

1. Open Junk Email Options
2. Select the sender from the Blocked list
3. And click Remove

By following these you will see the appearance of their email in your inbox again.

How to Block Email Domain in Outlook

If you are witnessing spam emails keep coming from the different addresses from the same domain then only blocking individual senders is not enough here you need to block the entire domain to stop all emails from that source.

This method is best suitable for businesses and organisations where spam frequently originates from marketing campaigns or fake domains.

How to Block Email Sender in Outlook Using Rules

Blocking email senders in Outlook is quite simple if you want to block just choose Outlook rules that provides you more flexibility than basic blocking so you can:

• Move your emails to a specific folder
• Delete emails automatically
• And filter by sender name or domain and keywords

This rule is my personal favorite because I do not want to completely block a sender but I still want to keep my inbox clean.

Bonus Tips:- Analyze Email Senders for Better Blocking

For users who are managing large Outlook mailboxes analyzing sender patterns helps them identify repeat offenders.

The SysTools Outlook Email Address Extractor allows you to extract sender email addresses and review them before applying blocks or rules.

FAQs

Final Thoughts

Blocking unwanted emails in Outlook is quite easy as you just need to know about the right method and how you can implement it for your platform. So whether you are using Outlook desktop or Outlook 365 or the mobile app these tried and tested methods will help keep your inbox clean.