script to write virtusertable

looking for a script to write virtusertable

[malexs]

I am on a virtual user hosting at westhost.com, where i can add as many domains as i want, unfortunately their system does not allow for specific mail accounts to be set up.
IE. setting up user1@main_domain.com will also create email for user1@second_domain.com, user1@third_domain.com etc...

the only way around it is to manually edit the virtusertable and aliases files, which is easy to do but i was wondering if there is some php script that can do this.

I read this post (http://www.webmasterworld.com/forum40/363.htm) which is a similar problem, but the solutions available on freshmeat are too complex for what im looking for.

does anyone know of a simple script to do this.. thanks?