Sendmail to use Exchange 2003 (smart host) to relay mail

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http://www.linuxquestions.org – Hello, 1. How would I set up sendmail client to use my Exchange 2003 server to route e-mail? One problem I'm having is sending to a distribution list on the domain where there is a user account that is not on the windows domain. I get bounced with a "5.5.0 smtp;550 Sender verify failed" error for the user not on the windows domain. The windows domain user delivers fine (probably since the mailbox is local). Example: Distribution List ([email protected]) [email protected] (user on windows domain) [email protected] (user outside local domain) Here is another (HowTos)