Configuring Outlook for domino Server

Hi Friends ,

In our company a user wants Outlook to be configured so that he can send and receive mail thru domino server

he will access from outside our firewall

we have a domino SMTP server , purely a SMTP server (which even do not have SMTP listner task avaible )

If i enable it , how can i see that only this user is able to use my SMTP server to send mail not any other person

also how can i also see that mail are send only thru @MYdomain.com

for POP3 access he can access thru our web server ,