Postmark

Postmark is a fast and reliable transactional email service that is trusted by thousands of developers across the globe. With Postmark, you can rest assured that your emails will arrive, on time. And if an issue was to occur Postmark provides 45 days of full content history, recipient information, and message events to help you get to the bottom issues. If that's not enough they also provide great support via email, live-chat, or 1-on-1 calls.