[Dovecot] Dovecot v2 multiple domains

Hello,

I would like to have multiple domains on same server (with different ip's) and I want that user logs with username with domain part for every domain, but I can't find any documentation on this. To be more precise I found a post regarding dovecot v1 that suggest making separate init scripts for every domain but it also suggest that dovecot v2 will support this in code. This is the post

http://dovecot.org/pipermail/dovecot/2006-April/012455.html

Am I missing something or this is not still possible?