Header-only deliverability check

Is this message spam or just a junk-folder confuser — read it from the headers.

Paste any email's raw header block (the section above the message body — Gmail "Show original", Outlook "Internet headers", Apple Mail "Raw Source") and we'll parse From, Return-Path, Reply-To, the Received chain, the DKIM-Signature and the Authentication-Results, then give you an Authentication-Results summary (SPF/DKIM/DMARC pass/fail), the received-chain hop count, the common spam-flag signals driving the verdict, and a 0-100 overall spam-likelihood score.

Paste the raw headers — get a 0-100 spam-likelihood score
Paste the header block (the section above the message body) — for example the "Show original" output from Gmail, "Internet headers" from Outlook desktop, or "Raw Source" from Apple Mail (or drop a .eml file). The analyzer reads From, Return-Path, Received, Authentication-Results and DKIM-Signature and returns a score + 3-5 signals driving it + the SPF / DKIM / DMARC verdicts inferred from the authentication headers.
Continuous header-based deliverability monitoring?
One email and we'll let you know when ReputaPilot opens up — header-level authentication scoring, deliverability, blocklist + reputation coverage, with an email the moment an analysis flips.

Drop your email above — we'll only ping you about the header analyzer / deliverability monitor. No newsletters, no upsells.

Have a specific question? Email us

FAQ

Email header analyzer — frequently asked questions

Pair this checker with the guide

Want the bigger picture on sender reputation?

The verdict this analyzer returns is the receive-side rendering of your reputation — what the receiving mail server actually saw on this one message. The full reputation guide explains how those per-message SPF/DKIM/DMARC verdicts, hop counts, and spam-flag signals feed the cumulative Postmaster Tools and Microsoft SNDS scores that drive the composite placement Gmail and Outlook deliver. For a sender-domain or IP reputation check alongside the message-level evidence, use the blacklist lookup checker.

Read the sender reputation guide →