And then somehow they managed to totally disregard their customers' needs and screw everyone with the Mandrill changeover. Seriously, has everyone forgotten that fiasco? https://news.ycombinator.com/item?id=11170713 I'll never trust them or use them again, after that. No way no how.
My understanding of that is that the term customer shouldn't apply to free tier heroku spammers. It is a very secretive company about most things related to way of business, so I can only speculate and from what I heard around town, but most of the customers there were not good sustainable fits. I've had extremely negative experiences in their customer support, but also extremely positive experiences through their co…
We then switched to Amazon SES but still have a bitter feeling about MailChimp and will move our services that are using the full MailChimp product. Some of the change was indeed to control spammers, but when you are forcing over enterprises sending 100's of thousands of emails without complaint, that starts crossing the line where you want to better monetize your product. Giving your customers 60 days to engineer a different solution after they invested in your product is not good business.