Sidekick, a tool published by Marketing guru HubSpot, promises the ability to be in control of your email. It lets you know who opens your email (selectable setting), when, how many times and from where.
From their site, HubSpot touts the following capabilities:
SEE WHO OPENS AND CLICKS YOUR EMAILS
Get live notifications when someone opens or clicks on your emails. Know when and have access to this information instantly. You choose which emails are tracked.
POWERFUL PROFILES IN YOUR INBOX
As you compose an email, have all the relevant information about your recipient. See past contact history, social media content, mutual connections, and more.
SCHEDULE EMAILS: WRITE NOW, SEND LATER
You decide when an email should be sent and Sidekick will automatically send it at that time. Have the full control to change that date/time or even cancel it all together. Own your inbox!
There is a free and a premium version available, depending on your needs and level of integration with other apps/tools that you may require.
Interested to learn more? Here is a link to a 3rd party review of the product:
https://zapier.com/zapbook/sidekick/review/
Sidekick works with Gmail, Outlook and Apple Mail. Some competitive offerings include: Contactually, Insightly, and FullContent among others. http://www.hubspot.com/products/sales/email-tracking
Every Hero Needs a Sidekick
