Hello Darren,
As a bulk delivery service, a huge part of our job is providing great deliverability for all our customers. ISPs and spam filters are becoming more sensitive to certain types of keywords and content.
Keeping this in mind, MailChimp is not able to serve as your email provider, because the content associated with your industry conflicts with our acceptable use policy. For direct questions regarding our acceptable use policy and the types of content that aren’t supported, please visit our Acceptable Use policy under Prohibited Content: http://mailchimp.com/legal/acceptable_use
Nothing personal against your content or industry; there are just some very strict spam filters and ISP rules that we have to comply with to maintain the best possible sending environment. These filters are becoming increasingly sensitive to certain keywords because some industries tend to generate greater than average complaint rates (legit or not) with their emails. A risk that we unfortunately cannot take.
We appreciate your understanding in this matter.
The account is open so that you may log in anytime to back up data. If you have any questions related to billing, please contact billing@mailchimp.com.
All the best,
The MailChimp Compliance Team