I have a customer who polls e-mail for a number of accounts in domain example.com via POP. Now they have a VIP user email@example.com who wants to use Microsoft Hosted Exchange on his mobile phone.
Unfortunately the descriptions of Hosted Exchange aren't too detailed and in heavy Microsoft lingo. My question is: Can it be configured so that it handles mail for this single user, while all other mail accounts remain on the POP server?
One approach for inbound mail would be to buy Hosted Exchange for a dedicated domain, such as exchange.example.com and reroute firstname.lastname@example.org to email@example.com.
Which leaves outbound mail: Can Hosted Exchange be configured to relay mail through my mail relay where I can rewrite the sender firstname.lastname@example.org to email@example.com? Or can it forge the sender address on outbound mail altogether, without relaying through my server? (SPF records are not an issue.)