Ok, here at work on our nt servers we use Imail which we are able to setup users by a db. So in other words without having to use an alias unlimited amount of users with the name jon can be on the server , well as many jons as their are domains.
Now, how might i do this using linux? Is it possible? Anybody know of a tutorial? Should i use qmail or sendmial or something else?
I can't tell you much more than, yes, this is possible with Linux. Using exim and mysql for instance this will work. However, I don't have much experience in this field. The exim homepage has excellent documentation and describes how to do database lookups. As for the mysql part you can probably use whatever frontend you want to add users to your database or even do that by hand on a mysql shell 'cause the database structure for such a purpose is very simplistic.