[going_to_800]

Postmark is the best in my opinion. Stay away from Sparkpost as much as you can, the worst service I encountered.

They're shutting down accounts without any notice. It doesn't matter how many emails you sent, that you have 0 spam complaints, extremely low bounce rate ... on the first issue they're banning your account.

We used them to notify our customers when new people sign up on their portal so we included details about those users, including the website. We got JUST ONE, SINGLE .tk domain in the email content and they blocked our account completely. We were also on their Premier plan.

No notice before-hand, no warning, nothing.. they simply blocked the account and haven't activated it back even after numerous requests. They couldn't point to any document that stated their policies and what rules we should follow or why they banned us.

tl;dr. Stay away from Sparkpost, they ban your account without notice.

[roseway4]

I work for SparkPost and would be happy to escalate for further review if you provide me with a ticket number or contact details.

[lfrodrigues]

Very happy with mailgun. We had the same experience with sparkpost.

Our account (that we had been using for 6 months) was locked right after we paid a bit over $200 for October.

We filled a ticket and gave them all the info they requested. Eventually the reply was a template that didn't explain anything. They also refused to refund the remaining credits.

Here the nice rejection email:

Thank you for your interest in SparkPost. We strive to offer the very best email service, and to that end, we maintain a strict anti-abuse messaging policy.

Because we cannot offer you the high deliverability you would expect from SparkPost, we must decline to provide our services. We wish you the best in your future business endeavors.