We have a group of users from a department that want all external emails coming in to their individual mailboxes to be automatically forwarded to a distribution group. This is the process they want:
1. Externaluser1 sends an email to firstname.lastname@example.org
2. Exchange server receives the email and checks to see if the email address is external
3. If the email address is external, the Exchange server checks the recipient.
4. If the recipient is one of the specified recipients for the forward, the Exchange server sends the email to the defined distribution group
5. If the recipient is not one of the specified recipients for the forward, the email is delivered to the recipient
They want this configured so that all external emails going to this group of people, goes to a distribution group. If anyone in this group sends an email internally to someone else in the group, then the email gets delivered to the individual's mailbox. They only need to worry about external emails.
I was reading up on Microsoft's Intelligent Message Filter but I don't believe it does exactly what we need Exchange to do.