Email tracker lets you know when they open your message

[Misfit]

http://fusion.net/story/302032/email-tracking/

The pixel is an image that calls back to YesWare’s server in order to load, forcing the reader’s phone or computer to make a connection with the server, allowing YesWare, in most cases, to get information about the reader and report it back to their customer.

Sometimes, it’s better to live in ignorance, and not know that your message has been read but ignored. Once you have this knowledge, it can be anxiety-producing.

 

[LibertyBeacon]

Thus are the risks of html e-mail. I reject anything but text-only and don't really have this concern.