relay control -is this possible problem

[reach_prashant]

      hello friends 

i have configured relay on the basis of ip addresses with tcpserver and
tcp.smtp  . now , actually want i want is to allow relays from my server on
the basis of  ip address that i allowed in my "tcp.smtp" as well as their
from address (which they configure in this mail clients like outlook,
metscape messanger etc )  must have " @mydomain.com" ,  
      

   is there any way by which i can control , this ? ,


 thanks & regards 
Prashant Desai