Email Authentication Checker

Verify your SPF, DKIM, and DMARC records instantly. Ensure optimal email deliverability and protect your domain from spoofing.

SPF Check

DKIM Keys

DMARC Policy

ESP Detection

Check Your Domain

Enter your domain name to check authentication records
Leave blank to auto-discover all DKIM selectors

Powerful Features

SPF Analysis

Detailed breakdown of your SPF record with DNS lookup counting and policy validation.

DKIM Detection

Auto-discover DKIM selectors including CNAME delegation detection for SendGrid, Mailgun, etc.

DMARC Verification

Check DMARC policies, enforcement levels, and reporting configuration.

ESP Detection

Automatically detect email service providers (SendGrid, Mailgun, Amazon SES, etc.)

Health Scoring

Get a comprehensive email deliverability score and actionable recommendations.

Key Analysis

Verify DKIM key strength with detailed bit-length analysis and security recommendations.

Why Use Our Tool?

Instant Results

Get detailed authentication reports in seconds

Detailed Guidance

Step-by-step instructions to fix configuration issues

DKIM Caching

Faster lookups with intelligent selector discovery

228+
Domains Analyzed
60+
DKIM Selectors
15
ESPs Supported
100%
Free & Open

Frequently Asked Questions

SPF (Sender Policy Framework) is a DNS record that specifies which mail servers are authorized to send emails on behalf of your domain. It helps prevent email spoofing by allowing ISPs to verify that incoming mail comes from a mail server approved by the domain owner.

DKIM (DomainKeys Identified Mail) lets you digitally sign your emails. The recipient's mail server verifies that the message was actually sent from your domain and that it hasn't been altered. It uses public/private key cryptography to sign messages.

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is a policy that tells receivers what to do with emails that fail SPF or DKIM checks. It can also provide reports on authentication results, helping you monitor and prevent email fraud.

Our tool provides a health score (0-100) and detailed analysis for each authentication method. Green indicates good configuration, yellow indicates warnings, and red indicates critical issues. We also provide specific recommendations for improving your setup.

We support major ESPs including SendGrid, Mailgun, Amazon SES, Postmark, Mailchimp, SparkPost, Brevo, HubSpot, Google Workspace, Microsoft 365, and many more. Our tool automatically detects which ESP you're using based on your SPF record.