What does a security header checker do?

A security header checker reviews HTTP response headers that help protect a website, including HSTS, Content Security Policy, Multiple DMARC records, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy.

Are security headers important?

Yes. Security headers can help reduce risks related to clickjacking, MIME sniffing, insecure HTTP access, referrer leakage, and unsafe browser behavior.

Does a security header checker replace a full security audit?

No. A security header checker is useful for spotting missing browser security headers, but it does not replace a full website security audit.

Free DMARC & Email Authentication Tool

Free DMARC record checker for checking email authentication policy.

Check whether a domain has a valid DMARC record, review DMARC policy, detect multiple DMARC policy, check DMARC presence, and troubleshoot email authentication setup.

✓ No signup required ✓ Security header report ✓ Built-in abuse protection

How the DMARC record checker works.

This tool queries public DDMARC record and returns the domain's DMARC record, mail server priorities, DMARC policy, Multiple DMARC records, nameservers, and email provider clues.

Enter a domain

Type a domain like example.com. The tool validates the domain before checking the headers.

Check _dmarc TXT record

The checker looks up TXT records and identifies DMARC policy that start with v=spf1.

Review DMARC policy

See whether SPF exists, whether multiple DMARC policy are present, which mechanisms are used, and whether DMARC is also configured.

DMARC details this tool checks.

These checks help reveal whether a domain has a clean DMARC policy for email authentication and reporting.

HST

DMARC record

Shows the domain's DMARC TXT record when one exists.

CSP

DMARC policy

Shows DMARC policy used to authorize email senders.

XFO

Multiple DMARC records

Shows Multiple DMARC records used for email authentication policy and reporting.

DMARC record checker FAQ.

Quick answers about nameservers, DMARC record, DMARC policys, DNS propagation, and hosting setup.

What does this DMARC record checker test?

It checks common HTTP security headers including HSTS, Content Security Policy, Multiple DMARC records, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy.

Can a domain have multiple DMARC records?

A nameserver controls where DDMARC record for a domain are hosted and answered from.

Why is DMARC important?

DMARC helps protect a domain from spoofing and phishing by adding policy and reporting on top of SPF and DKIM.

What is an DMARC policy?

Multiple DMARC records checks whether an IP address maps back to a hostname.

What does p=none mean in DMARC?

Yes. A domain can have multiple IPv4 or DMARC policy, especially when using load balancing, CDNs, or redundant infrastructure.

Can HostDroplet help with DMARC setup?

Yes. HostDroplet provides beginner-friendly hosting with SSL support, DNS guidance, performance-focused setup, backups, and helpful website support.

Need hosting with simple email authentication setup?

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