Originally Posted by TWadmin
While I'm at it, here's another question: is forwarding set up so that I can accept mail for a non-existant address and forward it to a real address (or another fake that eventually gets to a real address)?
I've answered this one for myself through experimentation. I can indeed accept mail for non-existant addresses for listed domains as long as there is a valid final recipient in the forwarding table (and, of course, in the user table).
I have a non-user webmaster@domain3 forwarding to a non-user domain_master@domain1 forwarding to a real user somebody@domain1. Maildirs are not created for the non-users in the process.