All tools05 / MAIL / HEADERS

Email Header Analyzer

Paste email headers to see delivery path, delays, TLS encryption and spam analysis.

ABOUT EMAIL HEADERS

Email headers are present in every email and contain important diagnostic information: delivery path, delays, anti-spam results and encryption. This tool makes them readable.

WHAT WE ANALYZE

[+]

Delivery path

Every hop from sender to recipient

[+]

Delays

Time per hop — find bottlenecks

[+]

TLS encryption

Which hops use STARTTLS

[+]

SPF, DKIM, DMARC

SPF, DKIM, DMARC and ARC, including the original result

[+]

Spam analysis

Spam score and why mail lands in spam

[+]

Return-Path

Mismatch between From and Return-Path

[+]

DMARC alignment

Why SPF or DKIM does not count for the From domain

[+]

Sender signals

Reply-To, display name, Message-ID, originating IP, DKIM signatures

HOW DO I FIND EMAIL HEADERS?

Gmail: Open the email → three dots → "Show original"
Outlook: Open the email → File → Properties → Internet headers
Thunderbird: View → Message source