1. X-Originating-IP - The IP address of the email was sent from (this is known as an X-header)
2. Smtp.mailfrom/header.from - The domain the email was sent from (these headers are within Authentication-Results)
3. Reply-To - Instead of replying the From email address, this is the email address specific to receiving replying emails
Reference: https://web.archive.org/web/20221219232959/https://mediatemple.net/community/products/all/204643950/understanding-an-email-header
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