Trying to get my head around Sendmail 8.13.3 on a test server.

I have a sendmail.cf file that has lots of complex routing for user names (we forward mail to different servers depending on their location).

When I installed SpamAssassin and re-created the sendmail.cf based on the sendmail.mc file I lost all the complex routing (don't worry I took a copy first).

First question is where do you add the complex routes to the Sendmail.mc file (or should it be somewhere else entirely)?

Second question is where do you specify the server to forward all the mail to rather than trying to deliver it to a user on the Sendmail box itself?

Stefan