Parse raw RFC 5322 email headers to trace message routing hops, analyze latency, and inspect SPF, DKIM, and DMARC authentication verdicts.
Input Workspace
Characters: 216Words: 24Lines: 5Size: 216 Bytes
Output Result
Time: 0 msOutput: 0 Bytes
Tool Customization
No customization controls needed for this tool. It transforms text automatically!
100% Client-Side Privacy & Large-Text Ready
Supports text inputs up to 50 MB. Computations execute entirely within your local browser memory with zero server uploads.
Validation Guide
About the Email Header Analyzer & Security Inspector (SPF, DKIM, DMARC)
When troubleshooting email deliverability issues, diagnosing spam folder placement, or investigating suspicious phishing emails, the raw RFC 5322 email header contains the complete cryptographic and routing audit trail. The Email Header Analyzer & Security Inspector parses raw email headers in real time. It extracts Sender and Recipient addresses, visualizes server-to-server routing hops with delivery latency calculations, inspects SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC authentication results, and identifies potential email spoofing threats with zero server logging.
In-Depth Technical Guide
How Email Header Analyzer & Security Inspector (SPF, DKIM, DMARC)Works & What the Results Mean
Anatomy of RFC 5322 Email Headers & Security Protocols
An email header contains detailed metadata generated by each Mail Transfer Agent (MTA) handling the message:
Authentication-Results & Security Verdicts:
SPF (Sender Policy Framework): Verifies whether the sending mail server's IP address is authorized in the sender domain's DNS TXT records (pass, fail, softfail).
DKIM (DomainKeys Identified Mail): Validates a cryptographic public/private key digital signature attached to the message body and headers to prove the email was not tampered with in transit.
DMARC (Domain-based Message Authentication): Aligns SPF and DKIM with the visible 'From' address, declaring whether receiving servers should reject, quarantine, or deliver failing messages.
Received Hop Tracer & Latency Calculation: Parses chronological Received: from ... by ... with ... headers from bottom to top, measuring time delays between intermediate mail relays to locate delivery bottlenecks.
Message Metadata: Extracts Message-ID, Subject, Date, Return-Path, and Reply-To addresses.
Step-by-Step Guide
How to Use Email Header Analyzer & Security Inspector (SPF, DKIM, DMARC)
1Copy the raw email headers from your email client (e.g. In Gmail: click the 3 dots $\rightarrow$ 'Show original'; in Outlook: 'View message details').
2Paste the raw headers into the editor workspace.
3The tool automatically parses headers and generates structured security reports in real time.
4Review the Authentication Verdicts card displaying SPF, DKIM, and DMARC results (Pass / Fail / Neutral).
5Inspect the Server Routing Hop Trace table showing each intermediate mail server IP, hostname, and transit latency in seconds.
6Review the Core Header Summary (From, To, Subject, Date, Return-Path, Message-ID).
7Click 'Copy Summary' to copy the security report to your clipboard.
Capabilities
Key Features & Highlights
Comprehensive RFC 5322 email header parser extracting all standard and custom X- headers.
Alerts the investigator to an unauthorized sender IP and domain mismatch.
Common Questions
Frequently Asked Questions
In Gmail: open the email, click the three vertical dots next to Reply, and select 'Show original'. In Outlook: open the email, go to File > Properties, and copy the 'Internet headers' box.
