Email Headers Guide

Email headers, also called email metadata or internet headers, are automatically generated fields that record an email’s sender, recipients, subject, timestamps, delivery route, message format, and authentication details, helping mail systems process and verify messages. They can be viewed through options such as “Show Original,” “View Message Source,” or “View Raw Message” in major email clients including Gmail, Apple Mail, Outlook, Yahoo, and Thunderbird. Common informational fields include From, To, Subject, Reply-To, and Content-Type, while technical fields such as Return-Path, Received, Message-ID, and MIME-Version document delivery handling and message structure. Security-related headers, particularly SPF, DKIM, and DMARC results, can help senders improve deliverability and help recipients assess whether a message may be legitimate or fraudulent. The material also describes using email-testing platforms and header-analysis tools to inspect routing, detect configuration issues, review spam risks, and identify potentially suspicious sender IP addresses, while noting that headers may expose sensitive details and that visible sender information can be forged without successful authentication verification.

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