No clue how it works functionally these days. But it reminds me of tricks we pulled back in high school programming class. Our school was using Novell NetWare, and some students were given email addresses for various purposes. We discovered you could edit the From field, so it would display any text as your name and then your email address after it to the recipient on Novell's email client. If you added enough text, including whitespace, it would push the actual email address off screen(I don't remember if you could scroll to it or not).

We trolled each other in class with it a bit. But at one point some student not in our class sent out a mass email, which was against the rules. I replied with a From line as "Administrator" and a bunch of whitespace, telling the girl that she broke the rule and would be suspended for it. Our teacher made me apologize, and I was lucky that I didn't get into more trouble beyond that.