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, 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 Domain Email & MX Lookup Tool

Free MX record checker for checking domain email routing.

Check which mail servers handle email for a domain, review MX priority, SPF records, DMARC records, nameservers, and common email provider detection.

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

How the MX record checker works.

This tool queries public DMX records and returns the domain's MX records, mail server priorities, SPF records, 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 MX records

The checker looks up MX records, SPF records, DMARC records, and nameserver details from public DNS.

Review email routing

See which mail servers receive email for the domain and whether SPF or DMARC records are configured.

Email DNS details this tool checks.

These checks help reveal whether a domain has email routing configured and which provider may be handling mail.

HST

MX records

Shows the mail servers that receive email for the domain.

CSP

SPF records

Shows SPF records used to authorize email senders.

XFO

DMARC records

Shows DMARC records used for email authentication policy and reporting.

MX record checker FAQ.

Quick answers about nameservers, MX records, SPF recordss, DNS propagation, and hosting setup.

What does this MX record checker test?

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

What is an MX record?

A nameserver controls where DMX records for a domain are hosted and answered from.

What does MX priority mean?

MX priority controls the order mail servers should be tried. Lower numbers usually have higher priority.

What is an SPF records?

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

What is a DMARC record?

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

Can HostDroplet help with email DNS 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 setup?

HostDroplet provides fast, secure, beginner-friendly hosting for WordPress websites, small business sites, blogs, and online projects. Start with hosting that supports SSL, DNS setup, backups, performance, and helpful website guidance.

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