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Why should I use this over Mandrill? http://mandrill.com/

Mandrill's "mostly RESTful" API isn't remotely RESTful and only knows the POST HTTP verb.

Wow, Mandrill is significantly cheaper than postmarkapp who we use now. Anybody using Mandrill in production?

Going to use it to send a couple of thousand of emails with attachments like, tomorrow. Up to now it works great in my tests.

That's transactional. Sendy is bulk and should be compared with MailChimp, not Mandrill.