Email Header Analyzer

Paste raw email headers to inspect routing hops, authentication results, and message metadata.

Header analyzer

SPFpass

DKIMpass

DMARCpass

FromExample Sender <sender@example.com>

ToYou <you@example.net>

SubjectTest message

DateTue, 19 May 2026 10:00:02 +0000

Message-ID<abc123@example.com>

Authentication passed

SPF, DKIM, and DMARC all show pass in the Authentication-Results header.

2 received hops

Received headers show the mail path from sender systems to the final mailbox.

Received path

1. from mail.example.com by mx.example.net; Tue, 19 May 2026 10:00:00 +00002. from app.example.com by mail.example.com; Tue, 19 May 2026 09:59:58 +0000

What headers can reveal

Email headers show sender metadata, routing hops, authentication results, and identifiers that help explain how a message reached an inbox.

They are useful for debugging delivery, investigating spoofing, and checking whether SPF, DKIM, and DMARC passed.

Recommended next steps

Fix email delivery faster

Use the full health check when one DNS record is not enough to explain inbox placement.

Run health check

Learn the next repair step

Read the guides for SPF, DMARC, DKIM, and blacklist cleanup.

Read guides

Related guides

How to Read Email Headers

Learn which email headers explain sender identity, delivery path, and authentication results.

Why Email Goes to Spam

Common technical reasons legitimate email lands in spam and how to investigate them.

FAQ

Is it safe to paste email headers?

Headers can contain IPs, message IDs, domains, and routing details. Remove private information before sharing results.

Which header matters most for authentication?

Authentication-Results usually summarizes SPF, DKIM, and DMARC results from the receiving mail system.