Newsletters and transactional emails are not the same service. I signed up a client for transactional emails on Mandrill because the client was already locked into a newsletter vendor who doesn't support transactional emails. Now I need to explain to them why they need a second monthly newsletter vendor subscription? One that serves no purpose to their marketing team and was totally free until recently.

Plus I get the honor of having to justify why I made this choice in the first place. Or have to deal with scrambling to evaluate and migrate to a new vendor in less than 2 months, probably out of pocket too.

I purposely pointed the client to Mandrill because it was backed by Mailchimp and therefore less likely to fail than a startup.

I trust in a new product from an established company, and a year later come up looking foolish to my client. This isn't the first time Mailchimp has pulled the rug out from under me in front of a client. Not making the same mistake again. You're dead to me Mailchimp. Dead to me.