Email Header Analyzer
Decode raw email metadata, track Hop-by-Hop server paths, identify latency delays, and review SPF/DKIM/DMARC alignments.
Paste Raw Email Headers (Original Message Source)
MIME Headers & Deliverability Guide
Understanding how hops, SPF, and DMARC parameters affect deliverability scores.
What are Email Source Headers?
Email source headers are invisible metadata tags attached to every electronic letter. They list the detailed path of mail transfer agents (MTAs), security alignment stamps (DKIM/SPF signatures), authentication scores, timestamps, and spam filters. Pasting these headers into our tool lets you perform comprehensive deliverability audits.
Why check Transit Hop Delays?
Outbound letters occasionally take hours to arrive due to intermediate mail relay backlogs. By checking the delay in seconds or minutes between consecutive `Received` timestamp nodes, you can quickly diagnose if a particular sender gateway or receiving filtering MTA (like a corporate firewall) is delaying the email flow.
Understanding SPF and DKIM stamps
SPF (Sender Policy Framework) authorizes specific IP nodes to dispatch mail for your domain. DKIM (DomainKeys Identified Mail) appends unique cryptographic signatures validating email body integrity. When receiving servers parse these pass/fail results, they assign spam rating flags.
What is the Spam score meter?
Enterprise anti-spam tools (like SpamAssassin) inject headers specifying filter parameters, such as `X-Spam-Status` or `X-Spam-Score`. If an outbound email triggers multiple red flags (heavy image-to-text ratios, poor DNS records, suspicious keywords), the score surpasses threshold limits (typically `5.0`), and it is blocked.
Analyzing Email MIME Headers for Security Audits
Email headers contain the complete tracking log of a message's journey from sender to recipient. Because headers are hidden by default in email clients, most users only see the 'From', 'To', and 'Subject' fields. However, the raw MIME header block contains critical validation flags.
Our Email Header Analyzer parses raw mail headers to trace MTA routing hops, calculate transit latency between nodes, and audit security parameter alignments (SPF, DKIM, DMARC). This is an essential diagnostic utility for developers troubleshooting delivery delays and spoofing attempts.
Frequently Asked Questions
How do I view the raw headers of an email?
In Gmail, open the email, click the three dots icon on the right, and select 'Show original'. In Outlook, open the message options and copy the text in the 'Internet headers' box.
What does 'Authentication-Results' mean in a header?
This header field is generated by the receiving server. It displays the validation status of SPF, DKIM, and DMARC, indicating whether the email passed authentication.
Can sender headers be forged?
The 'From' name and address in headers can be easily spoofed. However, SPF and DKIM authentication records cannot be forged, which is why verifying alignment is crucial.
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