I don't think you have to change a lot of things. If the Ubuntu Postfix is of version 2.2.x (find out by running
Code:
postconf -d | grep mail_version
), then you have to change the format of the .cf files, as pointed out here:
http://www.howtoforge.com/forums/sho...ostfix+version
You can also find details about the changed format here:
http://postfixwiki.org/index.php?tit...IMAP_and_MySQL