I am currently using free version of Google Apps for hosting my email. It works great for my official mails but except for sending out high volume mails (registrations, forgotten passwords, newsletters etc) as there is a limit to how much traffic a particular account may generate (about ~500 emails a day / account ).
I am thinking about setting up my an SMTP server myself. I was wondering if it'll be possible to do that while Google App Mail still works in parallel? How about I setup on a separate subdomain (mail.example.com)?
PS: Paid version of Google Apps is also an option but under my circumstances it is not viable.