Is there some place that describes email processing? In particular, I've created two email users, and set my catchall to my cpanelname. I would like email to all three to go through spamassassin, and then through my exim filter. (I'm converting a pretty large .procmailrc file to exim). I'd just play with it, but I really need to have this working before I start receiving email here, so I can't just send email to user@mydomain to see what happens. Maybe there's some alternative method to do this: I thought about having them setup my free domain and seeing if I could bounce emails at it.

I'm also not 100% clear on how to get exim to deliver to the two email users. The exim.org documentation says to
save $home/mail/username
But when I look on the system, it appears that the directories are set up as $home/mail/domain/username/, with cur, new, and tmp subdirectories.

Sorry for all the questions, I'm new here...