I use Mandrill with Mailpoet (wp plugin), and have nothing but good things to say about them. You didn't ask, but we compared them with AWS, and the big proble

I use Mandrill with Mailpoet (wp plugin), and have nothing but good things to say about them. You didn't ask, but we compared them with AWS, and the big problem with AWS was that we had to throttle our own SMTP output. Mandrill will rate limit for you.