I have a client that has problems with his current outgoing mail provider. It seems he uses a server for incoming mail and another server (another provider) for outgoing. But since the outgoing mail service is randomly unavailable, he wants to change to my servers.

Is there a way to configure his outlook to use my MediaTemple servers only for outgoing mail **without making changes to the domain configuration** (DNS nor NameServer changes)? if so, how?