If you're a Mandrill user, you've probably already gotten an email from Mandrill that they will completely be integrated with MailChimp and will require a paid MailChimp subscription to continue its use. The cheapest paid MailChimp subscription at the moment goes for $20/month.

If you're bootstrapping a startup, you look for any savings you can get. That $20/month could be used for other things, like 4 DigitalOcean servers to run your apps on.

I signed …