authenticated SMTP

Configuring Exchange 2007 as an Authenticated or Anonymous SMTP Relay

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We’ve recently had to configure a couple of client’s SBS2008 Exchange 2007 servers to act as SMTP relays for remote users. Why not just use OWA or Outlook Anywhere? It mostly seems to be Mac users, in particular those with “MobileMe”, which insists on IMAP and SMTP to communicate with the mail server. Adding authenticated SMTP in Exchange 2003 was a pretty simple process, but the procedure in 2007 is not so obvious – read on to find out how to do that, and enable anonymous relaying too.