Shared Mailbox delegate - block delegate from sending emails

Super Contributor



1 regular mailbox for

1 shared  mailbox


user have send on behalf rights to shared  mailbox


requirement is to block from sending emails and force him to send mails using shared  mailbox


is this possible?

2 Replies

You mean prevent him from sending messages with his own account? No way to do that I'm afraid. The only thing you can do is create a transport rule that blocks the messages after they are sent via the client.

@Marvin Oco 


you can do it using third-party tools/services. 

Have a look at SmartReply cloud service.  It seems that "Uncoditional address rewriting rule" will fit your requirements.


If you run only Outlook for Windows, take a look at SetFrom add-in.