The biggest thing is just listing off all the many things you have to do to send email in any real way on your own. All the DNS settings, various schemes to ver

The biggest thing is just listing off all the many things you have to do to send email in any real way on your own. All the DNS settings, various schemes to verify you are who say you are, potentially dealing with getting blacklisted due to spam complaints, etc. If I were you guys I'd have page that was a big list of hassles of running your own mail server and give people that. That, and the ease of using one of the libraries and plugins available (I'm using the grails plugin) make it an easy choice.