Bounce Address Tag Validation

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

Sender : prvs=964d30bd2=test@contoso.com

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

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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: