This thread seems to have a lot of misunderstanding about OP's intent. No one was asking anyone else to do work for them, set up a mail server for them, etc. Just asking questions. I'm not going to speak on behalf of the owner(s) of this forum but I think it's perfectly reasonable to ask about alternatives without having a bunch of people say "there's only one way to do it!" I've set up a few PBXes and my partners in these projects have used gmail, sendgrid, some registrar's email service, and a local Exchange server as some that come to mind. So we have to do something different each time. If your only answer is "just use gmail" then maybe this thread was not one to reply to.
