Im missing an option for making an alias, wich sends mails to multiple receivers. Or call it a mail-group if you want. In short 1 mail address = multiple recipients. I'm a postfix/linux novice, but i can't imagine that it's not possible to do some how I've tried setting up 2 alias with the same "source" mail addy, and different recipient addy, but then none of the recipients got the mail. And thanks for at great piece of software - Now almost anybody is able to put op a working web/mail linux server.
It seems to me that he might be better off doing a multiple forward instead of an alias. You can put multiple email addresses separated by whitespace in a forward destination.