Email Deliverability & Spam Testing - Free Online Tool

Test your email authentication, spam signals, DNS configuration and technical deliverability. Get a clear score, identify problems and learn how to fix them.

SEE WHAT YOU GET

Email Deliverability Report

Demo report - illustrative results, not a real email test.

EXAMPLE OVERALL SCORE
6.3out of 10

9 of 10 checks assessed

Unknown checks earn no points.
SPF authenticationFailed
DKIM authenticationPassed
DMARC policy & alignmentPassed
SpamAssassin scoreWarning
Sender IP reputationUnknown
HTML & MIME structureWarning
What to fix first in this example

The sending IP is not authorized by the SPF policy. Publish one valid SPF record for the evaluated identity and include every authorized sending service.

See an Example Report
FROM SEND TO INSIGHT

How It Works

Use the message and sending platform you want to check.

01

Get your unique test email address.

Copy the personal address above. Each address accepts one test message.

02

Send an email from your email client or marketing platform.

Send a test copy using your usual sending configuration.

03

Review your score, technical checks and recommendations.

Choose Check Your Score. The report updates as the analyses finish.

TEN CHECKS. CLEAR NEXT STEPS.

What We Check

Authentication, sending infrastructure and the message itself - with unavailable checks clearly marked Unknown.

Email Authentication

Understand whether the sending service and message identity are authenticated and aligned.

  • SPF
  • DKIM
  • DMARC
Illustrative statusesPassWarningFail
Check an SPF record

Spam & Reputation

Review spam-rule contributions and the identity and blocklist signals of the sending IP.

  • SpamAssassin
  • Sending IP DNS blocklists
  • Reverse DNS / PTR and forward matching
From the demo reportSpamAssassin: Warning
Check an IP against blocklists

Technical Email Health

Find structural and delivery details that can affect handling and safe rendering.

  • SMTP TLS on the test delivery
  • Email headers, including List-Unsubscribe for identified mailing lists
  • HTML / MIME structure
  • Link syntax, DNS and visible destination mismatches
From the demo reportSMTP TLS: Passed
Inspect a saved email locally

Link destinations are not opened. Domain blocklist scanning and provider inbox-placement tests are not part of these ten checks. Read what each check measures.

A CLOSER LOOK AT YOUR CONFIGURATION

Free Email Testing & DNS Tools

Diagnose email configuration, authentication and deliverability problems with our free online tools.

01

Authentication & identity

Check who can send for your domain and how your brand is verified.

SPF Record Checker

Read your published sender policy, understand its mechanisms and find syntax or lookup-budget risks.

DKIM Record Checker

Check the public key behind a DKIM selector and see whether it is usable, revoked or malformed.

DMARC Record Checker

Understand the policy receivers find for your domain and where authentication reports are requested.

BIMI Record Checker

Review your BIMI record and logo prerequisites without assuming that every inbox will display your brand.
02

Receiving mail & DNS configuration

Review receiving mail servers and the policies that protect email in transit.

MX Record Checker

Look up your domain’s mail servers, review MX priorities and identify DNS configuration issues.

MTA-STS Checker

Check both halves of MTA-STS: DNS discovery and the HTTPS policy that protects receiving mail.

TLS-RPT Record Checker

See whether your domain requests reports about inbound SMTP TLS negotiation and policy failures.
03

Message & reputation

Inspect a saved message or investigate a sending IP.

EML / EMLX Viewer

Read a saved email, inspect its headers and download individual attachments locally.

IP Blacklist Checker

Look up a sending IPv4 in public DNS blocklists and distinguish a listing from an unavailable query.
A DIAGNOSTIC GUIDE

What Does Your Email Deliverability Score Mean?

Your report uses a weighted score out of 10. The equivalent 0–100 scale below shows the same color thresholds: 5/10 = 50/100 and 8/10 = 80/100.

0–49
50–79
80–100

Needs attention

Start with failed authentication and other flagged issues. Unavailable checks can also lower the score.

Review the findings

Some checks earned points. Work through the failures and warnings before your next send.

Stronger technical results

More of the weighted checks passed. Review individual warnings even when the overall score is high.

Your score reflects technical email configuration and spam-related signals. It does not guarantee inbox placement with Gmail, Outlook or other providers. Missing and unavailable checks earn no points. How the score is calculated.

BEFORE YOUR FIRST TEST

Frequently Asked Questions

Copy your unique test address, send your email to it from the platform you use, then choose Check Your Score. We analyze authentication, SpamAssassin signals, sending-IP reputation, DNS and message structure. This diagnoses technical risks; it does not test placement in Gmail, Outlook or other recipient inboxes.

Yes. Guests can view 3 tests per rolling 24 hours. A verified free account has a default allowance of 10 tests in that period; individual account limits may differ. The standalone DNS tools and local EML viewer do not consume this email-test allowance and have separate abuse-prevention limits.

SPF specifies which sending services may use an envelope-sender domain. DKIM signs a message so receivers can verify its signing domain and integrity. DMARC checks alignment with the visible From domain and publishes a policy for authentication failures.

No. Inbox placement depends on additional factors, including sender reputation, recipient engagement and provider-specific filtering. The score summarizes the technical evidence available in this test.

A new test address accepts one message for 24 hours. Guest report details are retained for 3 days after receipt. Account-owned history and database results have no automatic expiry and remain until you delete the test or account. Original SMTP spool files have a separate retention period of approximately 30 days after successful synchronization; queued messages may be retained longer. A minimal used-address record is kept to prevent reuse.

Read the full retention and privacy policy.

Ready to Test Your Email Deliverability?

Find authentication issues, spam signals and technical problems before they affect your email campaigns.

Start Free Email Test