For everyone reading this: DONT WORRY, it is 100% fake. They try and make you think your email server has been hacked by spoofing the FROM: header. This is a very easy thing to do. The fact that you or someone else received an email from a certain address DOES NOT MEAN that such address is the actual sender of the email (absurd, I know right??). This is the main point of the SCAM, because if they can do this, then you might believe what follows.
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It is indeed scary because the language is correct, some technical things that are mentioned in the email (such as pixel tracking) are doable and the continuous bombardment makes one wonder whether this could actually be true._x000D_
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So, DONT WORRY.