I had a user that was an external contractor. He was on a few distribution lists and wanted to receive those emails at his yahoo.com email account. Here is what I did to accomplish this:

I created a contact in Exchange for user1 with an external email of user1@yahoo.com.

I then created a user mailbox for user1.

I then went into mail flow settings and the properties of delivery options on user1 mailbox.

I then set to forward to the user1 contact account that I just created by browsing to user1 mail contact.

Now when email is sent to user1@domain.com it will forward to user1@yahoo.com.

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