I needed to redirect all emails coming to email@example.com to 5 different addresses, external and internal. I created a distribution group for that. I added 3 internal mailboxes, then created 2 external contacts, and added them to that group. Then I setup a redirect to that group. It works fine when I test it by sending and email to firstname.lastname@example.org from my internal mailbox. The email gets redirected to all mailboxes in that group. However, if I try to send a test email from outside mailbox (email@example.com), the email only gets to firstname.lastname@example.org and doesn't get redirected. In my gmail I get this:
Delivery has failed to these recipients or distribution lists:
CallCenterGroup@mydomain.com (this is the group I created)
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.
#550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##rfc822;email@example.com
Anyone got any ideas?