National Merchant Buying Society Ltd
Blacklisting Email Address Guide
***Ensure you have Micsoroft admin center access***
Introduction
This guide is used for if we get a lot off spam emails from a certain email address or domain. Or if the domain or email address is a threat to the business.
Steps
Step 1:
Log onto the Admin center with your admin credentials: https://admin.microsoft.com/Adminportal/Home?#/homepage
Step 2:
Click this link or copy it into the URL bar: https://security.microsoft.com/tenantAllowBlockList
This should take you to Microsoft 365 Defender: Tenant Allow/ Block List
Step 3:
By default it should take you to the Domains & Addresses tab however if it hasn’t click that tab under the title
Step 3:
Click Block
Step 4:
In the Domains & Address box, insert the domain name or address you wish to block. I have put an example below
Note: You can put as many addresses you want to block in. But give each address/ domain it’s own line
Step 5:
Set the ‘Remove block entry after’ to never expire and leave optional notes blank (This isn’t needed)
Step 6:
Click add and that’s it.