[SAtalk] postfix

[gentian]

Hi list,   I am thinking to use Postfix together with SpamAssassin and Amavisd. I guess maybe that is not the right list to ask this question but probably any of you has encountered this issue before.   With postconf -e "mynetworks=....." i can setup which machines are allowed to relay mail to my server, but as I am opened to internet, I do not want to allow relaying based on the IP address of the sender but based on my domain name. So every email that is sent to my domain.edu is allowed to be relayed, anything else is rejected.   Does anybody know this ?   Gentian