Tenon Post Office to Tiger Mail?

Hello all, I am wondering if anyone has experience converting from Tenon's Post Office to Tiger Mail Server? I currently run Post Office on an XServe. I have approx. 200 accounts set up for about 80 different domains. I read that Tiger Mail will handle virtual domains, so I am hoping this will work with all of my domains. Also, for some accounts, in Post Office I can have a primary address (say jim@domain.com) and then I can list "additional addresses" (say info@domain.com and sales@domain.com) - so messages to any of the three addresses end up in the inbox for jim@domain.com. Does Tiger allow this kind of thing or would I have to set them all up individually and just fwd from info@ and sales@ to jim@? And I take it there is no limit to the # of email accounts you can have? Any opinions on Tiger Mail/Spam Assassin "out of the box" effectiveness? thanks for any and all feedback