sendmail outbound relaying based on senders address
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Its called Smarttables. We set that up here. Our config was for an HP-UX server originating the email. It relays mail from one address domain (e.g. @primarydomain.com) through our MS-Exchange server. It relays mail from a secondary address domain (e.g. @secondarydomain.com) through a Linux server we built just to have sendmail for sending those mails.
I'd post the config we did but the HP-UX sendmail config is a customized by HP so I had to adapt what I found via Google to fit that. If you do a Google search for smarttable(s) you should find the information I did.
One note - I did a cut and paste from the link I'd originally found into the .mc file and had issues - that is because there are actually tabs rather than spaces in the file. I had to work out where those went by trial and error.
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