MailChimp - MailChimp is the best way to design, send, and share email newsletters.
GetNotify - GetNotify is a free email tracking software solution.
DidTheyReadIt.com - Free email tracking trial! Instantly track emails.
Audienceful - Modern email marketing and newsletters for busy teams/founders. Notion-inspired editor to compose emails fast. Lightweight automation builder for drip sequences and user onboarding. Segment multiple audiences. Cross-publish to Webflow. And more.
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
Mailgun - A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.