Brandt OSS

Mailster is a plugin for WordPress to create email marketing campaigns. It has numerous features, as it allows not only for one-time campaigns but also for scheduling them and creating autoresponders, for example, to welcome a new subscriber or client, and send automatic emails based on certain programmable rules. It is very easy to create beautiful newsletters as it includes options to create introductions of the latest posts with a wizard. Multiple lists can be created, imported from a CSV, and it supports multiple mailing services, including Amazon SES. One of the best features is the subsequent analytics of openings, which areas have been clicked, and by client, allowing you to know which recipient has opened and how they have interacted with the email.

Simple UX, but very powerful and flexible to create newsletters that keep pace with the best in the industry. Far more cost effective than competing solution. Can utilize your own mailservers or integrate with the likes of G Sute, SendGrid and more. Scheduling of delivery works well too so you don't hit any limits on your mail servers.