Mandrill integration?

I'm trying to figure out how to integrate Vanilla with Mandrill without using SMTP. My current host doesn't allow sending mail via external SMTP, and they throttle outgoing emails to 125/hour. I currently have 62 users of my forum, and if I turn on EmailSubscribe, well, you do the math and you'll see the problem.
Mandrill has an application API, however.
So I don't know where to start. Do I hack the Vanilla class.email.php so that it uses the Mandrill API instead of sendmail? Should I try writing a plugin? Should I hack the EmailSubscribe plugin to give it hooks to the Mandrill API?
Thoughts?????
0