I've figured out the mail, but I'm not posting it here. Pretty easy if you follow his instructions, his other comments have explained how to decode this, which is so far the easiest.

I guess he got the first one. I've got all of them, and now it's full circle.

It's just hex code, so it was really easy to guess it was some kind text encoding

Decoded by double flipping and rotating, and reversing the text:

Knowledge is power, wouldn't you say? Most have indeed said so. But as for all of you, you will now have to choose between your happiness or knowledge. Just know which is harder to gain and which is much easier. if you wam happiness you will have to work for it. if you want knowledge all you have to do is learn. Whoever you are as a person will decide the difficulty of gaining both or one of these things, but if you choose only one, you must sacrifice the other. Make your choice. Happiness: https://imgflip.com/i/85e6sa

cyptii.com
Replacement, Atbash cipher text is entered by default.