I have looked for a guide on the Internet on how to do this but I have never found one.
I am wishing to run a request tracker (RT) and need postfix. Now I already have the email coming in, sent to RT by fetch mail of a gmail account. Now how can I make it so that postfix sends replies and other stuff back to the users that will work with me having either just an IP for my postfix or my DNS. I guess to sum it all up, how can I use postfix with just an IP or a DNS that just translates to my IP though I can't do stuff like add on to the DNS like mail.mymachine.no-ip.org.
