Sendy is a self hosted email newsletter application that delivers your emails via Amazon Simple Email Service (SES).
Compared to hosted newsletter services, Sendy is an app you can install on your own server. That means, you don’t have to pay monthly fees just to maintain your account. As Sendy uses Amazon SES as the sending engine, deliverability is high at a very low cost.
Sendy uses multi-threading to deliver your emails to Amazon SES, Amazon in turn enable your emails to pass SPF & Sender ID policy checks enforced by many ISPs & DKIM-sign all outgoing emails to ensure high deliverablity rate.