It seems to be that AWS SES is cheaper and more flexible, but Postmark is essentially charging for giving you the typical use-cases and handling some of the problems almost-out-of-the-box?<p>For instance, while configuring AWS SES, I had to read through many documentation pages about DMARC, DKIM, SPF, Outlook protection, SMTP configuration, and Email+DNS (for Cloudflare).<p>Is my understanding correct that Postmark is just all of this low-level details as a service where you pay for an extra premium and support.<p>I assume you still would have to configure some infrastructure, but it'd mainly be things that they can't do themselves like setting up DNS records.<p>Some people claim that they got over 10% in open rates, but I wonder if that's because of some nice content analysis they do and some best practices around email protocols that go over my head, or if it's just the typical SPF+DKIM+DMARC issue.
For several years, postmark only allowed transactional email. This led to them having a very high reputation. They are now cashing in on that reputation by allowing increasingly spammy content.<p>In a couple years, they're deliverability will be no better than SES.