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    Email Deliverability Checker: trace every hop to the Inbox

    Paste the original message source and see the route it took, which authentication checks pass, and where your spam score loses points. It runs entirely in your browser, with no sign-up.

    Origin
    1,242 / 60,000 characters

    Parsed in your browser. Nothing is uploaded.

    Deliverability score
    23/100
    Transit time
    3m 32s
    Route swerves to Spam. Fix the red and amber stations.
    1. Origin
    9. InboxSpam
    ORIGINSPFDKIMDMARCALIGNMENTCONTENTLINKSUNSUBSCRIBEInboxSpam
    Checkpoint inspector

    SPF

    Warning
    Header line found
    Authentication-Results: mx.google.com; dkim=none; spf=softfail smtp.mailfrom=bounce.bulkmailer.example; dmarc=fail (p=NONE) header.from=growthco.io

    SPF result: softfail.

    Why it matters: SPF tells receivers which servers may send for your domain. A fail is one of the strongest signals for the spam folder.

    Copyable fix
    Publish one SPF TXT record at bulkmailer.example:
v=spf1 include:_spf.your-sending-provider.com ~all
(Use a single v=spf1 record and include every service that sends your mail.)
    Where the points went
    • SPF-9 / 18
    • DKIM-9 / 18
    • DMARC-18 / 18
    • Alignment-14 / 14
    • Content-14 / 14
    • Links-8 / 8
    • Unsubscribe-5 / 10

    Heuristic weights, not a mailbox provider's formula. Score of 70+ is shown as Inbox.

    Relay hops (3)
    1. web01.bulkmailer.example [10.1.1.1]
      Tue, 14 May 2024 09:00:09 +0000
    2. relay2.bulkmailer.example [10.1.1.2]
      Tue, 14 May 2024 09:03:12 +0000+3m 3s
    3. mx.bulkmailer.example [198.51.100.77]
      Tue, 14 May 2024 09:03:41 +0000+29.0s

    Delays use each server's own clock, so skew can distort them.

    How the trace works

    STOP 1

    Copy the original

    In Gmail open the message, choose the three dots, then Show original. In Outlook use File, Properties, Internet headers. Paste the full source, including the body.

    STOP 2

    Trace the route

    Press Trace route. The parser reads every Received hop, the authentication results and the message body locally, then walks the line station by station.

    STOP 3

    Fix the red stations

    Open any red or amber station to read the exact header line and a copyable fix. Flip What if fixed to preview the score after the change.

    Departures board: your questions

    SPF checks that the sending server is allowed to send for the Return-Path domain. DKIM checks a cryptographic signature from the d= domain. DMARC passes only when at least one of them also matches the visible From domain, which is called alignment.

    Connecting lines: where to go after the Inbox

    Once your message lands, the next job is writing outreach worth opening.

    Cold Email Generator

    Once your domain is clean, draft the first message your prospects will actually reply to.

    Follow Up Email Generator

    Keep the thread alive with polite, well-timed follow-ups that protect your sender reputation.

    Landed in the Inbox? Now start conversations that convert.

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