Senders of the email doesn’t know much details of receivers if you want to know details of receivers Sidekick is an Chrome extension that help you to know receivers. It shows person’s title, company, social profiles, recent tweets, recent conversations, email opens or clicks, and other email activity.
Senders doesn’t email is opened or not it gives when your email was opened. See where, when, and how many times they opened or clicked. This extensions help to set schedule emails to be sent in the future as well as create recurring emails to be sent later.