Right now we are just running the Agent Scoreboard development box on EC2. Eventually I want to move our production system to the platform for the scalability that it offers. The main problem I have come up against was email delivery from the system. Emails sent to a gmail.com account and a couple others were delivered successfully, but had issues sending to yahoo, hotmail and various other servers. Once I sat back and thought about this it made perfect sense. I can not set a reverse DNS entry for the IP the server is running on. This is getting my messages flagged as possible spam or getting rejected totally. Looking around found a couple sites that with act as an SMTP server for us for a reasonable price. Here are some that I found: authsmtp.com, dnsmadeeasy.com, easydns.com