Intro This tutorial walks through adding e-mail to a Rails app, using MailChimp and Mandrill. We will: Add new users to a mailing list Send a welcome e-mail to new users Alert users when something happens in the app Our example app is Puppify, an aggregator of cute puppy videos. Read the tutorial, and then check out the source. Mailing lists vs. transactional e-mails It is important to distinguish