Do you read my email content?

No. We only access metadata such as message size, labels, and dates. Email bodies are never read or stored.

Are my emails permanently deleted?

Emails are moved to the Gmail Trash folder. Gmail purges the Trash folder after 30 days, giving you a 30-day window to undo any actions.

Email Header Analyzer — Trace Email Route & Check SPF/DKIM/DMARC (Free)

Name: Smart Mailbox Cleaner
Author: Smart Mailbox Cleaner

Paste email headers to trace the delivery path, check SPF/DKIM/DMARC authentication, detect delays & spam flags. 100% client-side, free, no signup.

What are Email Headers?

Email headers are hidden technical metadata records attached to every message transmitted across the internet. They record the exact IP addresses, mail transfer agents (MTAs), transmission timestamps, TLS encryption ciphers, and authentication results (SPF, DKIM, DMARC).

How to Find Email Headers

Gmail: Open message → click three dots (⋮) → "Show original" → copy headers.
Outlook: Open message → File → Properties → copy Internet headers. In Outlook Web, click ••• → View → View message details.
Apple Mail: View → Message → All Headers (Cmd + Shift + H).
Yahoo Mail: Click More (•••) → View raw message.

Key Email Authentication Protocols

SPF (Sender Policy Framework): Verifies that the sending server's IP address is authorized to transmit email on behalf of the domain owner.
DKIM (DomainKeys Identified Mail): Uses cryptographic digital signatures to ensure that message content and headers were not modified during transit.
DMARC (Domain-based Message Authentication): Aligns SPF and DKIM with the header From address and instructs receiving servers on policy enforcement (none, quarantine, reject).

Frequently Asked Questions

What are email headers?

Email headers are hidden metadata fields attached to every email. They record the path the message took through intermediate servers, timestamps, cryptographic authentication (SPF, DKIM, DMARC), and spam filter scores.

How do I find email headers in Gmail?

Open the email in Gmail, click the three vertical dots (More options) in the top-right corner of the email message, and click "Show original". Copy the text on the page.

What does an SPF fail or softfail mean?

An SPF fail means the sending IP address was not authorized by the domain owner. A softfail indicates suspicion of unauthorized origin while advising cautious receipt.

What is the difference between DKIM and DMARC?

DKIM verifies message integrity using cryptographic signatures. DMARC aligns SPF and DKIM with the sender's visible From domain and instructs receiving servers on how to enforce authentication failures.

Can an email header be faked or forged?

A sender can fake the visible From line and early hops, but they cannot fake headers added by your recipient mail server. Our tool traces received hops from destination back to origin to detect mismatches.

Does this header analyzer upload my email or headers to a server?

No. The entire analysis is executed 100% locally in your web browser using JavaScript. No email text, headers, or IP addresses ever leave your machine.

Learn more about Smart Mailbox Cleaner → · Read Email Safety Guide →