Assuming I'm understanding you correctly you sent 11,000 emails in under 24 hours to 10-15 people? For a newly created account I could understand that raising a few red flags. Though that doesn't justify their support staff failing to respond to queries nor the immediate account termination.
I get the feeling they're having trouble with their sender reputation; one of our larger clients was recently switched to SparkPost from Mandrill ("it's too expensive!") and it's now a continual battle with delayed deliveries and mail being marked as spam. The issue never arose with Mandrill. (and yes, SPF and DKIM are correct)
I'm surprised OP is not aware that's the kind of sending that can raise a lot of red flags, before doing something like this on a new account I would have contacted support to make them aware of this situation.
Specially on smaller senders, reputation is everything.
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Assuming I'm understanding you correctly you sent 11,000 emails in under 24 hours to 10-15 people? For a newly created account I could understand that raising a few red flags. Though that doesn't justify their support staff failing to respond to queries nor the immediate account termination.
I get the feeling they're having trouble with their sender reputation; one of our larger clients was recently switched to SparkPost from Mandrill ("it's too expensive!") and it's now a continual battle with delayed deliveries and mail being marked as spam. The issue never arose with Mandrill. (and yes, SPF and DKIM are correct)
I must say I agree,
I'm surprised OP is not aware that's the kind of sending that can raise a lot of red flags, before doing something like this on a new account I would have contacted support to make them aware of this situation.
Specially on smaller senders, reputation is everything.