Bounce Address Tag Validation

It is the first time that I see the following sender value in a message tracking log.

Sender :

Explanation is simple due to using Bounce Address Tag Validation (BATV) method.

The history of email

I just read a nice article about the history of email. Unfortunatly this article is written in Czech:

But if you are interest in this topic you have a lot of alternatives in English. Just for example: