Free Email Header Analyzer & RFC 5322 Transit Inspector
Paste raw headers from Gmail, Outlook, or any MTA and get a readable diagnostic report: the full relay path with per-hop delays, SPF/DKIM/DMARC authentication results exactly as the receiver judged them, originating IP, and the delays or rejections that explain what actually happened to that message.
Email Header Analyzer & Hop Latency Tracer
Paste the raw internet headers (`Received:`, `Authentication-Results:`, `Message-ID:`) of any email to trace server transit hops, identify latency bottlenecks, and audit SPF/DKIM verification verdicts.
Tool Overview: What It Does & Core Purpose
When an email lands in spam or experiences delivery delays, the answers are embedded within its raw RFC 5322 internet headers. The **AutoSMTP Email Header Analyzer** unpacks this diagnostic metadata into a readable forensic report. It traces the exact path the message traversed from the originating MTA through intermediary relays to the final receiver mailbox, calculates hop-by-hop latency, and decodes the receiving server’s `Authentication-Results` header.Key Advantages & Architectural Benefits
Advantage
**MIME Header Deconstruction:** Parses folded multi-line headers into standardized structured key-value pairs.
Advantage
**Hop-by-Hop Transmission Audit:** Reconstructs the server relay path to pinpoint transmission delays and routing bottlenecks.
Advantage
**Receiver Authentication Verdicts:** Unveils how Google, Yahoo, and Microsoft evaluated your SPF, DKIM, and DMARC alignment in real time.
Advantage
**Client-Side Privacy:** Operates entirely in your browser memory—no email body or sensitive contact data is persisted.
Email Marketing & Cold Outreach Integration
How This Tool Accelerates Email Campaigns & Deliverability
Diagnosing why an email landed in the spam folder requires examining the recipient’s `Authentication-Results` and `X-Spam-Status` headers. AutoSMTP customers routinely use this analyzer to inspect test emails dispatched from their private PowerMTA/KumoMTA clusters to confirm 100% DKIM and DMARC alignment.Frequently Asked Questions (FAQs)
How do I view raw email headers in Gmail? ▾
Open the email, click the three vertical dots (More options) in the upper right corner, and select ‘Show original’. From there, click ‘Copy to clipboard’ and paste into this tool.
How do I view raw email headers in Microsoft Outlook? ▾
Double-click the email to open it in a new window, navigate to File > Properties, and locate the ‘Internet headers’ box at the bottom.
What does the Authentication-Results header reveal? ▾
It displays the receiving MTA’s cryptographic verdict: whether SPF passed for the envelope sender, whether the DKIM signature verified against the public key, and whether DMARC alignment criteria were satisfied.
Can headers reveal if an email was opened or forwarded? ▾
Standard headers reveal the delivery journey up to the moment the email arrived in the recipient’s inbox. Subsequent client opens and forwards are logged through tracking pixels or SMTP IMAP access logs.
Free tools help you audit and optimize individual elements, but sustained enterprise email delivery requires dedicated bare-metal infrastructure. AutoSMTP replaces fragile shared relays with private bare-metal PowerMTA and KumoMTA clusters configured automatically in 15 minutes.
Turnkey Dedicated Bare-Metal Clusters
Provisions fully licensed PowerMTA/KumoMTA clusters on enterprise bare-metal with flat predictable pricing and zero third-party markups.
Automated Gas-Pedal IP Warming
Monitors Google Postmaster spam ratios (<0.10%) and real-time deferrals across clean IPv4 subnets to scale daily send limits safely.
Native FBL & Socket Interceptors
RFC 5321 in-band 550 bounce suppression + automated Yahoo/Outlook CFL ingest to protect sender score automatically.
Fully Managed DNS & Auth
Pre-configured rDNS/PTR, SPF, 2048-bit DKIM, strict DMARC, and BIMI integration synchronized across your domain portfolio.
Deploy Your Dedicated Email Infrastructure Today
Stop risking your sender reputation on shared pools. Get dedicated IPv4 subnets, custom reverse DNS, and automated deliverability engineering.
Key capabilities
- Received-chain timeline with hop latency
- Authentication-Results parsing
- Origin IP and client detection
- Copyable diagnostic summary.
Frequently asked questions
How do I get an email’s headers?
Gmail: ⋮ → Show original. Outlook: View message source. Paste everything into the analyzer.
Why did my authenticated email still land in spam?
Authentication is table stakes; content, reputation and engagement decide placement. Run the Spam Checker and Reputation Check next.