[blueatlas]

A relative new player is MailerSend (https://mailersend.com/). We've moved all of our transactional e-mail over to their service.

They have a sensible onboarding and UI/dashboard. The dashboard makes it clear how to set up SPF, DKIM and DMARC. There is a generous free tier for a single domain. A single paid account supports multiple domains starting at $25/mo for 50k outbound. Support has been excellent.

And the biggest upside is that their shared IP range, so far, is clean and not blacklisted. That was the clincher for us.

I have no connection to MailerSend other than as a happy customer.