Free tool
Domain Health & DNS Checker
Check your domain's DNS setup, SSL, and security headers in seconds -- see exactly what a real editorial partner would see before agreeing to collaborate with you.
What this domain checker looks at
This free tool runs the same kind of checks a technically-minded editor or partner would run before agreeing to work with your site: does the domain actually resolve, is it delegated to real nameservers, does mail sent from it authenticate properly, and is the site itself served securely. None of this requires you to install anything or hand over credentials -- it's a read-only look at what's already publicly visible about your domain.
Why SPF, DKIM, and DMARC matter
SPF, DKIM, and DMARC are DNS records that tell mailbox providers which servers are allowed to send email as your domain, and what to do with messages that fail that check. Without them, it's far easier for someone else to spoof your domain in a phishing email, and your own outreach is more likely to land in spam. They're also one of the simplest, most concrete signals that a domain is actively maintained rather than abandoned.
Why HTTPS and security headers matter
A valid TLS certificate is table stakes at this point -- browsers actively warn visitors away from sites that don't have one. Headers like Strict-Transport-Security, X-Content-Type-Options, and a Content-Security-Policy go a step further: they tell the browser how to treat your site defensively even if something else on the page goes wrong. Sites that get these basics right tend to also take the rest of their publishing operation seriously.
How this connects to safe collaborations
Domain health is exactly what PressCircle checks before a member's profile goes live: every publication verifies ownership of its domain through a DNS record, the same category of check this tool runs on demand. If your domain scores well here, you already meet the bar for a verified PressCircle profile -- and can start finding genuine, on-topic collaborations instead of chasing cold outreach or link brokers.
Frequently asked questions
Is this domain health checker free to use?
Yes. There's no signup and no email required -- just enter a domain and get results immediately. A light per-IP rate limit keeps the tool available for everyone.
What does the domain checker actually look at?
DNS resolution and nameserver delegation, SPF/DKIM/DMARC email authentication records, HTTPS, and common security headers like Strict-Transport-Security and Content-Security-Policy.
Does checking my domain change anything or need my login details?
No. It's entirely read-only -- it looks up publicly available DNS records and fetches your homepage the way a browser would. No credentials or account access are ever requested.