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ABOUT ME

I am Shaun, a driven consultant excited about all things Microsoft. I have spend
a number of years helping customers migrate their environments to Microsoft 365
as well as Microsoft Azure. The technology I focused on the most was Microsoft
Exchange and over the years I started moving more towards Microsoft's cloud
technologies. In my blog you will find topics around Azure, Exchange, Teams,
Intune and a few PowerShell here and there :) . I am a major Lego Fan boy and
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HOW TO UNBLOCK A USER IF THEY WERE BLOCKED FROM SENDING EMAILS IN MICROSOFT 365

Published by lazy-admin on Apr 1, 2022


HOW TO UNBLOCK A USER IF THEY WERE BLOCKED FROM SENDING EMAILS MICROSOFT 365

Users in your organization might get blocked from sending emails in Microsoft
365 if they exceed one of the outbound sending limits or inbound spam policies.

If a user is added to the restricted user list, they will receive the following
NDR when trying to send emails out of the organization.

> “Your message couldn’t be delivered because you weren’t recognized as a valid
> sender. The most common reason for this is that your email address is
> suspected of sending spam and it’s no longer allowed to send email. Contact
> your email admin for assistance. Remote Server returned ‘550 5.1.8 Access
> denied, bad outbound sender.”

Admins in your organization can remove users from the restricted users list,
this can be done either via the Microsoft Defender 365 portal or via PowerShell.


TO REMOVE THE USER FROM THE RESTRICTED LIST IN THE MICROSOFT DEFENDER 365 PORTAL

 1. Open the Microsoft 365 Defender portal https://security.microsoft.com.
 2. Go to Email & Collaboration > Review > Restricted users.



 1. Click on Restricted user page



 1. On the restricted users page, you will see a list of users who are blocked
    from sending emails from your organization.
 2. Review the user you would like to unblock, Select the user, and then click
    on Unblock.



 1. Once you click on Unblock a page with actions will open, here you have an
    option to Enable MFA for the users.
 2. When you’re finished with the actions and recommendations for the user,
    click on Submit.
 3. Click YES to confirm the change.



In the next post, we will look at the Alert settings for restricted users.

Post Views: 194

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Next Post Verify alert settings for restricted user in Microsoft 365 Defender.


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