ThinkShould has had the privilege of working with MailChimp for several years on the flagship MailChimp Drupal integration module and now on their exciting new transaction email service, Mandrill. In our humble opinion, MailChimp is heads and tails the most innovative email services company out there, and the friendliest to boot. In their own words,
MailChimp helps you design email newsletters, share them on social networks, integrate with services you already use, and track your results. It's like your own personal publishing platform.