In my previous tutorial, I wrote about digitally signing emails in Apple Mail to ensure that an email being sent or received is verified as coming from a trusted source. While this does nothing to hide the contents of the email from prying eyes, it does serve to identify the users involved in sending and receiving messages at a more secure level.
If a message being received on your email client cannot be verified, chances are the message in question could have been modified during transit. This alerts you to proceed cautiously, as its integrity may have been compromised.
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