I have a Redhat Enterprise Server 4 that I'm running.
I'd like to set up a mail service that would enable me to have virtual domains on it. i.e. a.com , b.com , c.com that are separate and used by different clients.
in windows this would be very easy, I'd install a simple mail server and it would do it for me.
How can I possibly do this with Linux? I've sendmail installed but I don't know anything about it.
I need to have POP3 connectiivty from the internet to this server, and all customers with different domains should use the same public ip that this server has.
Please provide me step by step instructions if possible.