Sailor, Fetchmail can get mail from various accounts at various domains, Spamassassin seems to do a decent job at picking out spam (although I need to tweak it a lot until it works as good as my previous setup!), and Postfix is a fully qualified POP3 server.
As for hotmail: dunno if Fetchmail can get those. I expect it to; at the very least I expect there to be *a* program that can do it.
I'd say that Oberon must be using some sort of forwarding system for Postfix to get those e-mails - or he's doing something with it that I haven't been able to do yet...
