In this email, someone called John Demos sent Mary Podesta an email titled "Thelema - a Favor".

Thelema is a belief strongly tied with Satanism, and is symbolized by the hexagram, which happens to resemble the shape of Comet's signboard. Another example. Note how the stars on each corner are all upside down, too.

Anyway, back to the sender. His email address is [email protected]. I found someone who was posting about "Orphan Benefits" (which sounds suspicious on its own) under the same address here:

I am a civil service retiree and my wife is a FERS/Civil Service retiree.I understand there is a benefit our disabled son is elegible to receive titled the "double orphan". Is our son eligible to receive benefits from both of us? If so, what is the current amount one could expect?

Note that he is a civil service retiree. Turns out, the author of "Entertaining Satan: Witchcraft and the Culture of Early New England", John Putnam Demos, was also doing civil service. I found this on the last sentence of the page 235 of "Ye Heart of a Man", where it says:

1. Some age restrictions on military and civil service existed, but most men maintained their positions until disabled by age. See John Demos, Past, Present, and Future.

This is the same John Putnam Demos, who according to Wikipedia, is a descendant of the Putnam family who was prominent in the Salem witch trials. According to a NYT article titled Entertaining the Devil in Connecticut, he is a witchcraft expert.

I haven't read the content of the book, but considering how much these people enjoy hiding in plain sight, I think the titles of the email and the book alone are enough to speculate that this man could be another Satanist, like John Podesta.