At work we have built an email delivery platform on top of Mandrill for marketing/transactional emails. We have many clients that signed up for their own accoun

At work we have built an email delivery platform on top of Mandrill for marketing/transactional emails. We have many clients that signed up for their own accounts and give us api tokens to send on their behalf. This is going to suck. Not only are they doing this but now we only have 45 days to migrate those customers to mailchimp accounts they neither want nor need and we don't get to see the headaches there until March 15th. What the actual fuck?!?