What I'm trying to do is forward incoming mail to an address to 3 email addresses. One of them being an external address.
What I've done is created the new user. I then created a contact card with the external address that it needs to be forwarded to. I then created a distribution group and included 2 the users and the 1 contact card in the 'members'. Then on the original user account I've changed the Mail Flow Delivery Options to 'Forward to' the Distribution Group. From everything I've Googled this is the exact method for doing what I'm trying to accomplish. However, when I send a test email it gets bounced right back to me with the following error
Delivery has failed to these recipients or distribution lists:
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
I did just figure out however. If I forward the Users email to JUST the contact card with the external address, that works. It only fails when trying to forward to the distribution group.