Free Email Authentication Tester

Send a test email and check your authentication in real time

SenderClarity's free email tester analyzes a real email you send — checking SPF, DKIM, DMARC, and ARC authentication as it actually appears in your email headers. Get a deliverability score with actionable recommendations. No account required.

Start an investigation to receive a unique probe email address. Send a test email to it and we'll analyze your authentication results.

Send a test email to this address

Copy the address below and send a test email from the system you want to investigate.

Email authentication score based on SPF, DKIM, DMARC, and ARC results.

Authentication Results for

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Full email authentication analysis

SPF

Result

DKIM

Result

DMARC

Result
Policy

ARC

Result

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This investigation has expired. Start a new one to test your email authentication.

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How It Works

Test your email authentication in three simple steps — no account, no sign-up, completely free.

1

Start an Investigation

Click the button to generate a unique probe email address for your test.

2

Send a Test Email

Send an email from your mail system, CRM, or marketing platform to the probe address.

3

Get Your Results

See your SPF, DKIM, DMARC, and ARC results with a deliverability score and recommendations.

What We Analyze

Our email tester inspects the actual authentication headers from the email you send — not just your DNS records.

SPF Authentication

Verifies that the sending server is authorized by your domain's SPF record to send email on your behalf.

DKIM Signature Verification

Checks that your email carries a valid DKIM cryptographic signature and that it survived in transit without modification.

DMARC Policy & Alignment

Analyzes your DMARC policy enforcement level and checks whether SPF and DKIM domains align with your From address.

ARC Chain Validation

Validates the Authenticated Received Chain, which preserves authentication results when emails are forwarded through intermediary servers.

Reverse DNS Lookup

Checks that your sending IP has a valid reverse DNS (PTR) record, which receiving servers use as a trust signal.

Deliverability Score

Combines all authentication results into a single score with a letter grade, so you can see your email security posture at a glance.

SenderClarity vs Other Email Testers

Unlike DNS-only checkers, SenderClarity's email authentication tester analyzes a real email you send — checking SPF, DKIM, DMARC, and ARC results as they actually appear in your email headers.

Feature SenderClarity Mail-Tester MXToolbox EasyDMARC
Send real test email ✓ ✓ — —
SPF check ✓ ✓ ✓ ✓
DKIM check ✓ ✓ ✓ ✓
DMARC check ✓ ✓ ✓ ✓
ARC chain validation ✓ — — —
Reverse DNS lookup ✓ ✓ ✓ —
Deliverability score ✓ ✓ — —
Actionable recommendations ✓ Limited — —
No account required ✓ ✓ Partial Partial
Ongoing DMARC monitoring Free trial — Paid Paid
Spam content analysis — ✓ — —

When to Use This Tool

Use SenderClarity's email tester whenever you need to verify that a sending system is properly authenticated.

Setting up a new email provider

Verify SPF, DKIM, and DMARC pass before going live.

Troubleshooting deliverability issues

Find out why emails are landing in spam or being rejected.

Verifying Salesforce, HubSpot, or SendGrid

Confirm that your CRM or ESP is signing emails correctly.

Pre-campaign authentication check

Test before sending a marketing campaign to avoid bounces.

After DNS record changes

Confirm that updated SPF, DKIM, or DMARC records are working.

Onboarding a new sending service

Validate authentication before adding a new third-party sender.

Frequently Asked Questions

Yes. SenderClarity offers a free email authentication tester that checks SPF, DKIM, DMARC, and ARC by analyzing a real email you send. No account or sign-up is required. You get an instant deliverability score and actionable recommendations to fix any issues.
The most reliable way is to send a real test email and analyze the authentication results in the headers. SenderClarity's email tester generates a unique probe address — send an email to it from your mail system, and you'll see exactly how SPF, DKIM, DMARC, and ARC performed, along with alignment details and your DMARC policy.
A DNS checker looks up your published SPF, DKIM, and DMARC records to verify syntax and configuration. An email tester goes further — it analyzes a real email you send to check whether authentication actually passes in transit. This catches issues a DNS lookup alone cannot detect, such as DKIM signature failures, SPF alignment mismatches, and forwarding-related problems. SenderClarity offers both: standalone DNS checkers and this send-and-analyze email tester.
Yes. SenderClarity's Email Authentication Tester works like a traditional mail tester: you send a real email to a generated probe address, and it analyzes SPF, DKIM, DMARC, and ARC authentication results from the actual email headers. It also provides a deliverability score, reverse DNS lookup, and actionable recommendations — all for free with no account required.
Yes. SenderClarity's email authentication tester is completely free and requires no account or sign-up. Click Start Investigation, send a test email, and get your results instantly. You can optionally provide your email address to receive a detailed report.
Start a test on SenderClarity's email tester, then send an email from Salesforce, Google Workspace, Microsoft 365, or any other platform to the generated probe address. The tool analyzes the actual authentication headers to show you whether SPF, DKIM, and DMARC are passing correctly for that specific sending system. This is the most reliable way to verify that your email provider is properly authenticated.
ARC (Authenticated Received Chain) preserves email authentication results when messages are forwarded through intermediary servers like mailing lists or forwarding services. Without ARC, forwarded emails often fail SPF and DKIM checks even when the original sender was properly authenticated. SenderClarity is one of the few free email testers that checks ARC chain validation alongside SPF, DKIM, and DMARC.
Both SenderClarity and Mail-Tester let you send a real test email for analysis. SenderClarity checks SPF, DKIM, DMARC, and ARC authentication with a deliverability score and actionable recommendations — and also offers free DNS checkers and ongoing DMARC monitoring. Mail-Tester focuses more on spam content scoring and inbox placement. For a complete email security picture, SenderClarity covers authentication while Mail-Tester covers content analysis.

Related Tools

SPF Checker DKIM Checker DMARC Checker BIMI Checker