Tagged: email-headers
How to Read Email Headers
A practical, field-by-field guide to reading raw email headers and knowing which lines to trust.
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How to Trace an Email Using Its Headers
Follow the Received chain from the first server to your mailbox, and learn what an email trace really shows.
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How to Read Received Headers
Break a Received header into its clauses and follow a message hop by hop.
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What Is a Return-Path?
The Return-Path is the bounce address: here is how it differs from From and what it does and does not prove.
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What Is a Message-ID?
The unique label every email carries, how threading uses it, and why it is not proof of origin.
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How to Detect Email Header Spoofing
Technical indicators of spoofed headers, and why none of them is proof on its own.
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How to Investigate Suspicious Emails Using Headers
A calm, step-by-step workflow for reviewing a suspicious message's headers.
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What Does SPF PASS Mean?
What an SPF pass proves, what it does not, and how it fits with DKIM and DMARC.
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What Does DKIM PASS Mean?
What a verified DKIM signature proves, how to read the tags, and what it cannot tell you.
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What Does DMARC PASS Mean?
DMARC ties SPF and DKIM to the visible From domain. Here is how a pass is decided.
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What Does a Different Reply-To Address Mean?
Why Reply-To and From sometimes differ, when that is normal, and when to take a closer look.
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