Mandrill

Mailchimp users can use Mandrill as a transaction email API. It can send personalized and targeted one-to-one messages to customers filled with data driven information. Some features are dedicated IP pooling, automated dedicated IP warmup, multiple domains for each account, automatic feedback loop registration, and more. Mandrill contains in-depth analytics, dynamic and templates content, customizable sending options, and dynamic integrations.

With Mesa and Mandrill together, you can send out important information based on an event that occurs.