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
Comments
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