We were using Mandrill's email to HTTP feature for delivering inbound emails into our web services. The cutover period for needing to be a paying Mailchimp is April 27th, so we had two months to convert. Luckily it took less than a day to build and test the same functionality using Amazon SES, so we've already converted away. To be fair, it was functionality we were using completely for free, so I expected it to happen sooner rather than later.