I've set up a web server on a Rackspace cloud server, and that is running fine and doing everything I need.
Now I am trying to figure out how to add the ability to send and receive e-mail. I've found a bunch of great tutorials on "how to set up a mail server," but I can't figure out whether it is possible to set up a mail server on the web server.
Is this possible? If so, generally speaking, how is it done? If not, do I need to just create a separate server as my mail server? Thank you for any guidance!