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Sextortion - Blackmail Email

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We are currently receiving a number of Crypto based Sextortion emails and would like to block them, they appear to be spoofed headers so the emails look to have come internally or from our contacts. 

They contain an image of the text spiel and was wondering if there was a way to stop these coming through?

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Check out this thread: https://forum.eset.com/topic/14855-spoofed-email-address/ ; namely:

Quote

-EDIT- Appears TechNet article is not longer available. Here's another reference: https://returnpath.com/downloads/authenticating-email-dmarc-spf-dkim-quick-start-guide/

Edited by itman

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