[orliesaurus]

Amazon's email service is extremely cheap [1]. I don't think you can go cheaper than them?

https://aws.amazon.com/ses/

[fvargas]

Do you know how SES stacks up against services that focus solely on email?

It looks like a great deal if you already use EC2 because of the free 62k outgoing emails/month. But there doesn't seem to be a free tier otherwise.