mailmark VS Trackapp.io

ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.

Pointofmail.com - Know who, when and where read, clicked and forwarded your email.

Intelliverse Email Tracker - Intelliverse Email Tracker provides insights to increase the ​productivity of your emails.

Komiko - Komiko is a sales intelligence solution to drive sales, retention and expansion.

MailChimp - MailChimp is the best way to design, send, and share email newsletters.

GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!