I have a scenario where I need to setup an out of office for a user that does not exist in my exchange org (OrgA). The user exists in OrgB but for another reason, we have emails being sent to this user in OrgA. So I need a mechanism to send out of office type notices to anyone that sends email to this non existant address, advising them to resend to the correct address. Do I have to setup a mailbox for this user in OrgA to facilitate this? Is there any other way to do this? What is the best way to achieve this? Thanks

You could create a Contact object in OrgA and set the target address to correspond to the SMTP address of the OrgB recipient. Set the address that people are incorrectly sending to as a secondary SMTP address on the Contact. That way, the emails will simply be re-directed and not non-delivered. Tony

Hi Tony, thanks for the update. I looked at doing this early on, but we have legal reasons where we cannot be seen to accept emails for that user within OrgA. The mechanism has to reject them and send an NDR or OOF explaining this user does not exist in this org, but providing the correct email contact address. Is there no other mechanism available? Thanks for the input.

In that case, I can't think of any other way to do it with Exchange other than creating a mailbox-enable user and setting the OOF response. Tony