What are SPF, DKIM, and DMARC?

SPF specifies which servers can send email for your domain. DKIM adds a cryptographic signature to emails to prove they are authentic. DMARC tells receiving servers what to do with emails that fail SPF or DKIM checks.

What grade should I aim for?

An A grade means all three records (SPF, DKIM, DMARC) are properly configured. This gives you the best email deliverability and protection against spoofing.

How do I fix a low grade?

The tool shows exactly which records are missing or misconfigured. You will need to add DNS TXT records through your domain registrar or DNS provider.

Can I check any domain?

Yes. You can check the email health of any domain, not just your own. DNS records are public.

Home Developer ToolsEmail Health Check

email setup. instant grade.

check if your domain's email authentication is set up correctly. scan SPF, DKIM, and DMARC records and get a letter grade.

free use available

What is Email Health Check?

Email Health Check scans your domain's DNS records and grades your email authentication setup. It checks SPF, DKIM, and DMARC records and tells you exactly what is configured, what is missing, and how to fix it.

Proper email authentication prevents your messages from landing in spam folders and protects your domain from being spoofed by phishing attacks. This tool instantly shows whether your domain is properly protected.

Enter your domain name and get a letter grade (A through F) based on the completeness and correctness of your email authentication records.

How to Use Email Health Check

1
Enter your domain
Type your domain name (e.g., example.com) — no https:// or www needed.
2
Run the scan
The tool queries DNS records for your domain's SPF, DKIM, and DMARC configuration.
3
Review your grade
See an overall letter grade and individual pass/fail status for each authentication method.
4
Follow recommendations
For any failing checks, the tool explains what is missing and what DNS records to add.

Common Use Cases

New domain setup

Verify that email authentication is properly configured after setting up a new domain.

Deliverability troubleshooting

Diagnose why your emails are landing in spam by checking authentication records.

Security audits

Verify that your domain is protected against email spoofing with proper DMARC policies.

Client onboarding

Check a client's email health as part of a marketing or IT audit.

Vendor verification

Check whether a vendor's domain has proper email authentication before doing business.

Frequently Asked Questions

more free tools

PDF utilities, image tools, developer helpers — all free, no signup.

🎨

placeholder image generator

Generate placeholder images with custom dimensions, colors, and text.

🖥️

screenshot to mockup

Drop a screenshot and frame it in a device mockup — iPhone, MacBook, iPad, Browser, or Android.

💻

text to binary/hex

Convert text to binary, hexadecimal, and decimal byte values in real time.

🌐

ip address lookup

See your public IP address, location, ISP, and timezone instantly.

✏️

markdown editor

Full-featured Markdown editor with toolbar, live preview, word count, and export.

{ }

json formatter

Paste your JSON and instantly format, validate, or minify it.

browse all 41 tools