In my opinion, sendgrid is complete garbage compared to Postmark, it's not even a comparison. I had issues with emails being sent to spam using sendgrid IPs. The dashboard is inferior, the setup is fairly comparable in difficulty, and ongoing visibility is inferior.
Verified User
Engineer
Chose Postmark
I've also used AWS Simple Messaging Service (SES) but couldn't select it from the above, as well as the old one Mailchimp used to run and shut down. We had big deliverability issues with those services, inconsistent but often for self-hosted email providers and free email …
They are a bit different and, in many cases, it makes sense to use both Postmark and Mandrill. Aside from these two, I don't have experience with other email delivery services. Both tend to be extremely reliable and rarely fail to send and deliver emails. Both are …
We found Postmark early on and have not looked back. There has never been a need to reevaluate the solution, as its cost is fair and the service has functioned as expected. We regularly recommend Postmark to our partners.
We felt Postmark's focus on transactional emails and their use of shared domain reputation made them stand out. We also like their user interface and ability to have many virtual email servers. Pricing was competitive and after a trial we saw a big increase in deliverability …
In terms of UI and deliverability, Postmark really blows other ESPs out of the water. We've seen a huge improvement in delivery rates, especially for Outlook/Live/Hotmail email addresses.