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Email Header Analyzer

Paste or upload email headers to audit authentication, routing, compliance, and sender trust signals.

Analyze Email Headers in Seconds

Only received emails contain complete headers. Upload (.txt/.eml file) or paste raw header of the version that was accepted by the recipient’s mail server.

Supported formats: .txt, .eml (max 256 KB).

From Header Confusion to Deliverability Clarity

Run this analyzer before major sends to catch hidden authentication, compliance, and routing issues before they hurt sender reputation.

Stop Sending Blind on Header Health

Email headers carry the technical truth mailbox providers use to score trust. One malformed field, failing authentication result, or misaligned sender domain can reduce inbox placement and campaign performance.

This Email Header Analyzer turns raw metadata into clear, prioritized action items so your team can fix issues fast and send with confidence.

Why Header Analysis Is Non-Negotiable

Header-level diagnostics give you the earliest warning signals for deliverability, compliance, and sender reputation issues.

  • Authenticate with confidence: Validate SPF, DKIM, DMARC, and ARC outcomes from real header samples.
  • Protect sender trust: Detect blacklist exposure and weak DNS alignment before high volume campaigns.
  • Improve compliance posture: Catch unsubscribe and list header gaps that increase complaint risk.
  • Resolve faster: Convert technical metadata into plain-language, actionable fixes.

Authentication Breakdown

Inspect SPF, DKIM, DMARC, and alignment outcomes as they appeared on the analyzed message.

Blacklist Visibility

Check extracted sender IPs and domains against trusted public DNSBL sources.

Compliance Signals

Validate List-Unsubscribe, one-click support, list identity, and reply-path hygiene.

DNS Cross-Check

Verify SPF, DMARC, DKIM selector, BIMI, MTA-STS, and MX records tied to sender identity.

Fast Track to Cleaner Header Integrity

  1. Input: Paste raw headers or upload a .txt/.eml header file.
  2. Analyze: Run an end-to-end review across eight technical deliverability sections.
  3. Prioritize: Resolve high-severity findings first using suggested fixes.
  4. Re-test: Re-analyze a new sample header to confirm improvements.

Need Experts to Fix Header Issues Quickly?

Our deliverability team can harden your authentication stack, resolve sender reputation risks, and stabilize inbox placement before your next launch.

Email Header Analyzer FAQs

What can this email header analyzer detect?

It reviews authentication, routing quality, blacklist exposure, compliance headers, and DNS dependencies from your provided header sample.

Can I upload an .eml file instead of pasting?

Yes. Upload a .txt or .eml file and the tool extracts and analyzes the header block automatically.

Do you store uploaded headers?

No. Header data is processed in-memory for analysis and not stored as persistent scan history.

Should I run this before every campaign?

Yes, especially before high-volume sends, infrastructure migrations, or major authentication changes.

More FAQs