matt, Since when has #Apple #Mail revealed the sender's #IP address in the email headers?!
Just seen this in an email I sent to myself from a #Gmail account I manage with Apple Mail for example:
Received: from smtpclient.apple ([<MY_IP_ADDRESS>]) by smtp.gmail.com with ESMTPSA id
I have confirmed it on another email I received from someone, apparently, using Apple Mail with their Dreamhost #email account.
Seems like a #security concern to me!