Free Domain Health Checker – Complete Email Security Analysis

What is a Domain Health Checker?

A Domain Health Checker is a comprehensive diagnostic tool that analyzes your domain’s email authentication and security configuration. It performs multiple checks including SPF, DKIM, DMARC, BIMI, and DNS health to provide an overall assessment of your domain’s email deliverability and security posture.

Our Domain Health Checker performs real-time analysis of all critical email authentication protocols, validates DNS records, checks for common misconfigurations, and provides a unified health score with actionable recommendations to improve your domain’s email security and deliverability.

What We Check

How to Use the Domain Health Checker

1. Enter Your Domain: Type your domain name (e.g., example.com) into the input field.
2. Click “Check Domain Health”: Our tool will perform comprehensive analysis of your domain.
3. Review Health Score: Get an overall score from 0-100 based on all checks.
4. Analyze Individual Checks: Review detailed results for SPF, DKIM, DMARC, and BIMI.
5. Follow Recommendations: Implement suggested improvements to enhance domain health.

Understanding Your Health Score

Your domain health score is calculated based on multiple factors:

• 90-100: Excellent – Full authentication with DMARC enforcement and BIMI
• 75-89: Good – Strong authentication but room for optimization
• 60-74: Fair – Basic authentication present but needs improvement
• 40-59: Poor – Missing critical authentication elements
• 0-39: Critical – Minimal or no email authentication configured

Why Domain Health Matters

Maintaining good domain health is crucial for:

• Email Deliverability: Properly authenticated emails have higher inbox placement rates
• Security Protection: Prevents domain spoofing and phishing attacks
• Brand Reputation: Protects your brand from unauthorized email use
• Compliance: Meets industry standards and email provider requirements
• Trust Building: Recipients are more likely to trust authenticated emails
• Visibility: BIMI enables logo display in supported email clients

Common Issues We Detect

• Missing or invalid SPF records
• Exceeding SPF DNS lookup limit (10 lookups)
• DKIM records not found or improperly configured
• DMARC policy set to “none” (monitoring only)
• Missing DMARC reporting addresses
• BIMI not configured despite meeting prerequisites
• DNS propagation issues
• Syntax errors in authentication records
• Weak cryptographic keys
• Missing Verified Mark Certificates

Best Practices for Domain Health

1. Implement All Three Core Protocols:
   • Configure SPF to authorize mail servers
   • Set up DKIM for message authentication
   • Deploy DMARC for policy enforcement
2. Start Conservative, Move to Strict:
   • Begin with DMARC p=none for monitoring
   • Analyze reports for 30+ days
   • Move to p=quarantine, then p=reject
3. Monitor Regularly:
   • Check domain health monthly
   • Review DMARC aggregate reports
   • Update records when changing email services
4. Optimize for Deliverability:
   • Keep SPF lookups under 10
   • Use 2048-bit DKIM keys
   • Set up aggregate reporting
5. Enhance with BIMI:
   • Once DMARC is at p=quarantine/reject
   • Create SVG Tiny PS logo
   • Obtain Verified Mark Certificate

Email Authentication Timeline

Implementing comprehensive email authentication takes time. Here’s a recommended timeline:

• Week 1: Audit current configuration, implement SPF and DKIM
• Week 2: Deploy DMARC with p=none, set up reporting
• Weeks 3-6: Monitor DMARC reports, identify legitimate sources
• Week 7: Move to DMARC p=quarantine
• Weeks 8-11: Monitor for issues, fine-tune authentication
• Week 12: Move to DMARC p=reject (if ready)
• Months 4-6: Prepare BIMI (trademark, VMC, logo)
• Month 7+: Deploy BIMI for enhanced brand visibility

Industry Requirements

Major email providers have increasingly strict requirements:

• Google (Gmail): Requires SPF or DKIM for all senders, DMARC for bulk senders
• Yahoo: Enforces DMARC for all domains, rejects unauthenticated bulk mail
• Microsoft (Outlook): Strong preference for DMARC, may filter unauthenticated mail
• Apple (iCloud Mail): Supports all authentication protocols, displays BIMI logos

Frequently Asked Questions

How often should I check my domain health?

Check your domain health monthly, or whenever you make changes to your email infrastructure, add new email services, or experience deliverability issues.

Can I pass email authentication with just SPF?

While SPF alone provides some protection, best practice is to implement both SPF and DKIM, with DMARC providing policy and reporting. This layered approach offers the strongest security.

What if my domain health score is low?

Don’t worry! Follow the recommendations provided in your report. Start with critical issues (missing SPF/DKIM), then move to DMARC implementation, and finally optimize for best practices.

Will fixing these issues improve my email deliverability?

Yes! Properly authenticated emails have significantly higher inbox placement rates. Major email providers prioritize authenticated mail and may filter or reject unauthenticated messages.

How long does it take to see improvements?

DNS changes typically propagate within 24-48 hours. However, building sender reputation and seeing consistent deliverability improvements may take 2-4 weeks of proper authentication.

Do I need all four protocols (SPF, DKIM, DMARC, BIMI)?

SPF, DKIM, and DMARC are essential for security and deliverability. BIMI is optional but recommended for brand visibility once you have DMARC enforcement in place.

What if I use third-party email services?

You’ll need to include them in your SPF record and ensure they sign emails with DKIM using your domain. Most major services (Google Workspace, Microsoft 365, SendGrid, etc.) provide documentation for proper authentication setup.