Excelent tutorial!

Finally I could configure an e-mail server! Thank you!

I have one doubt. I'm not using ISPConfig (it's not easy to use for me yet).

The e-mail users are the server users (/etc/passwd). I mean that to create a new e-mail user I just create an user at the server (using adduser).

At the server I there are some users I don't want that they have e-mail addresses, is there anyway to avoid users to have e-mail addresses at an e-mail server?

Thank you so much!

[ ]s!