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Mailchimp offers Mandrill, which is a basic SMTP service.

Yeah, Mandrill/Mailgun/etc work just great. Used it in my last company.

Mandrill is transactional, so would be a no go for sending a message to 3500 clients. Mailchimp and mandrill don't overlap.

False.

> Technically, though, you can send any legal, non-spam emails through Mandrill.