Without knowing more about your setup, it’s difficult.
On Mac OS X, Postfix stores aliases in /etc/postfix/aliases.
You could add them into there, and then issue the command newaliases to update Postfix. (I’m not sure if the postfix reload command is needed after that but it certainly doesn’t hurt to issue it after newaliases.
There are also some plugins you might want to look at as well.
http://www.squirrelmail.org/plugin_view.php?id=37
But that plugin doesn’t change their email address.
http://www.squirrelmail.org/plugin_view.php?id=249
But, as it says “Currently it assumes that both main account and forwarding information are held in a database such as MySQL or PostgreSQL.”
But, like I said, without more info on your setup it’s hard to point you in a good direction.
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