DidTheyReadIt.com VS ClickNotifi

GetNotify - GetNotify is a free email tracking software solution.

MyBizMailer - Email marketing service from MyBizMailer.

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

Bananatag - Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.

iTrackmail - Want to know if people are reading the emails you send?

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