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by techcorner 3575 days ago
Like Mandrill, most (all?) of these companies have some warmup period. Start sending low volumes, then once you have enough reputation go to higher volumes.

I don't belong to any of these companies but as a client, use their services heavily. Imagine a spammer signing up with them and sending several thousands mails in a day. They deal with such notorious people on a daily basis.

I am not saying you may have done anything wrong but probably their system flagged you when you sent 11k emails to 10-15 people.

In any case here is my rec for you in order- 1. PostMark - They do strictly transactional email. 2. Mailgun 3. SparkPost 4. SES