It would be very useful to have an option of email tracker (Know when your emails are opened)
Much better into incoming … when opened,is in any situations not good … too late
I think that it is a useless feature. One of the first things I do on any email client is to disable automatic receive/read receipts, and if I get a manual one, I just ignore it. You can send me thousands of messages using some email tracker, but you will never ever get a response. So what is the point?
It would be interesting to know where the mail came from / via which way / possibly even the entry node
There is data in the message header, if that is what you mean. You can see the IP address and even the name of the computer it was sent from.
Thunderbird had this cool add-on that would display a map of origin and the route the message took to get to you.
yes, this is a ‘game’, which would be good here