We often get questions regarding mail forwarding in Exchange Online. As you already know, Exchange Online is a shared service. We must take care that users cannot take the service down by creating ma...
Updated Apr 30, 2021
Version 1.0
Blog Post
I ran into a situation where we had a Shared Mailbox that replied to an email address that it had received the email but the ReplyTo address responded that it was an unmanaged mailbox and that emails would be ignored. This went on until our Shared Mailbox hit the hourly External Send Email limit and was shut down for the remainder of the day.
How could we have stopped that loop from happening?
Thank you,
Shaun