550 5.7.1 Client Does Not Have Permission To Send as This Sender

Below are the steps you need to take in case you are faced with the "550 5.7.1 Client Does Not Have Permission To Send This This Sender" error.

This error can occur if authorization or migration to Exchange Server 2003 or 2010 is available.

The  user "NT AUTHORITY \ SELF" must have  send-as  authority.

Follow the steps below.

• First, Active Directory User and Computer login is required.

• On the Active Directory Users and Computers "View" menu, point to the Advanced Features tab.

• Right click on the user we want to give SendAs authorization and select "Properties".

• In the Properties window, go to the "Security" tab and click the "Advanced" radio button.

• Click on the "EDIT" button on the Permissions tab and select SELF on the user-group tab.

On the Permissions tab, the "allow" box is marked opposite the "SendAs" permission.

We are now authorized to send as for this user. you can now perform the send without receiving this error.

However, you may want to perform these steps for all users in bulk. In this case, I will share the PowerShell command because it will be difficult to do it individually.

You may get errors during the copy-paste operation, in which case you will have to write manually.

get-mailbox | add-adpermission -user "NT Authority \ Self" -ExtendedRights Send-As, Receive-As

can be useful with your wish ....