[IMail Forum] No user account NO MAIL!

[Taco Fleur]

Hello Everyone,   This is my first post to this List.   I would like to prevent people from sending mail through the email server that do NOT have an user account on the server. For example we have virtual domains   @joop.com @appie.com   Now Mark with his hotmail accounts wants to send a large email out but he can't do this through his server so he changes his settings in his mail program   Username : [EMAIL PROTECTED] Password : whatever Pop : mail.joop.com Smtp: mail.joop.com etc   At this moment mail can be send through our mail serve rlike that, while marc does not even have an account set up. Now I did look at the help files that come with the server, and the closed thing that I could see to stop this was No Mail Relay, but if I understand this correctly this means that only users on the server can send to users on the server, so they can't send any mail to someone that is not a user on the server.   Could someone please help me out with this one?   Regards, Taco