Like others here I recommend AWS SES. But you will need to manage DMARC, DKIM and SPF. Another very well done service but maybe a little expensive is Postmark.

Like others here I recommend AWS SES. But you will need to manage DMARC, DKIM and SPF. Another very well done service but maybe a little expensive is Postmark. I really like their simple and clean interface, their working code samples, and their focus on good delivery. I am a happy customer and I recommend them.