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 SPF 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 SPF & Email Authentication Tool

Free SPF record checker for checking email sender policy.

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

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

How the SPF record checker works.

This tool queries public DSPF record and returns the domain's SPF record, mail server priorities, SPF mechanisms, Multiple SPF 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 TXT records

The checker looks up TXT records and identifies SPF mechanisms that start with v=spf1.

Review SPF policy

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

SPF details this tool checks.

These checks help reveal whether a domain has a clean sender policy for email authentication.

HST

SPF record

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

CSP

SPF mechanisms

Shows SPF mechanisms used to authorize email senders.

XFO

Multiple SPF records

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

SPF record checker FAQ.

Quick answers about nameservers, SPF record, SPF mechanismss, DNS propagation, and hosting setup.

What does this SPF record checker test?

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

Can a domain have multiple SPF records?

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

Why is SPF important?

SPF helps receiving mail servers verify whether an email came from a server authorized by the domain owner.

What is an SPF mechanisms?

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

What does ~all mean in SPF?

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

Can HostDroplet help with SPF 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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