http://docs.amazonwebservices.com/ses/latest/DeveloperGuide/Welcome.html lots of useful information and their price seems not bad if you mailing clickers 0.1 per thousand and you don't need to worry about delivery
They run heavy content filters, rate limit you to about 1000/hour initially until they get a good idea of complaints and engagement of your data. They also don't allow third party / CPA offers..
I sent out maybe 5000 before they shit canned me.. I was sending transactional messages to seeds.. lol