I have installed Postfix on a server running RedHat 9 and I can send and recieve mail. The only problem is when I send out a message it sticks localhost into my return address.
For instance if my email address is supposed to be;
postfix sends it out with a return address of
So this means that when someone tried to reply to a message I send it doesn't work.
Also if a site is running spam software that checks to see if the return address is valid before delivering the message It won't deliver any of my messages.