Is your domain set up correctly?
Look up any DNS record on any domain. A, CNAME, MX, NS, TXT, DMARC, SPF, DKIM, CAA, SOA, AAAA. Runs in your browser via Cloudflare DNS-over-HTTPS. No signup, no API limits.
What each record actually does.
DNS records control two things: where your domain points (A, CNAME, NS) and whether your email is allowed to be trusted (DMARC, SPF, DKIM, MX). Get them right and your funnel loads, your emails land in the inbox, and senders trust your domain.
DMARC Email auth
_dmarc.yoursite.com TXT v=DMARC1; p=none; rua=mailto:reports@yoursite.com
Tells receiving mail servers what to do with email that fails SPF or DKIM. As of February 2024, Google and Yahoo require DMARC for bulk senders. Start with p=none to monitor, then move to p=quarantine or p=reject once you confirm legitimate senders pass.
SPF Email auth
yoursite.com TXT v=spf1 include:_spf.google.com include:sendgrid.net -all
Lists every server allowed to send email as your domain. Add an include for each email service you use (Google Workspace, SendGrid, Mailchimp, your ESP). End with -all to reject anything not on the list. Only one SPF record per domain.
DKIM Email auth
google._domainkey.yoursite.com TXT v=DKIM1; k=rsa; p=MIIBIjANBgkqh...
A cryptographic signature on every outgoing email. The public key sits in DNS at a selector subdomain (google._domainkey for Google Workspace, selector1 for Microsoft 365, k1 for SendGrid). Each provider gives you the exact record to paste.
MX Mail server
yoursite.com MX 10 mail.yoursite.com
Routes incoming email to your mail server. Lower priority numbers come first. Without MX records you cannot receive email on the domain. Google Workspace, Microsoft 365, and most email hosts give you the exact MX entries during setup.
A Domain setup
yoursite.com A 192.0.2.1
The IPv4 address your apex domain resolves to. Required for the root (yoursite.com without www) to load anything. If you host your site on a platform, the platform gives you the IP or asks you to use a CNAME flattening service instead.
CNAME Domain setup
www.yoursite.com CNAME yoursite.com
Points a subdomain at another hostname. Used to send www to the apex, or to point a funnel subdomain (offer.yoursite.com) at a hosted platform. CNAMEs cannot live on the apex itself, only on subdomains.
NS Domain setup
yoursite.com NS ns1.cloudflare.com ns2.cloudflare.com
The nameservers that publish all your other DNS records. Set at your registrar. If you moved DNS to Cloudflare or a host, NS records tell the internet to ask them instead of the registrar's default DNS.
Why this actually matters
Sources: Valimail State of DMARC 2024, Google Postmaster Tools sender requirements (Feb 2024), Postmark deliverability report.
Honest answers.
It checks seven DNS records: DMARC, SPF, and DKIM (the three email-authentication records that determine whether your emails land in the inbox), MX (your mail server), A (the IP address your apex domain resolves to), CNAME (where a subdomain like www or offer points), and NS (which nameservers control your domain). Every check returns a green or red status, the raw record value, and a fix suggestion if the record is missing or invalid.
DMARC (Domain-based Message Authentication, Reporting, and Conformance) tells mail servers what to do with email that fails SPF or DKIM checks. Yes, you need one. As of February 2024, Google and Yahoo require DMARC on any domain that sends bulk email. Without DMARC, your messages are increasingly likely to land in spam or be rejected outright. The minimum viable record is v=DMARC1; p=none; rua=mailto:reports@yourdomain.com placed on _dmarc.yourdomain.com.
SPF lists which servers are allowed to send email from your domain. DKIM signs each outgoing email cryptographically so receivers can verify it was not modified in transit. DMARC ties the two together by telling receivers what to do when SPF or DKIM fails (allow, quarantine, or reject) and where to send reports. You need all three. SPF and DMARC are TXT records on the root domain; DKIM is a TXT record at a selector subdomain like google._domainkey.yourdomain.com.
Log into the DNS settings of whoever manages your domain (often the registrar, sometimes Cloudflare or a hosting provider). Add a new TXT record for SPF (on the root), a new TXT record for DMARC (on _dmarc), and follow your email provider's instructions for DKIM (they usually give you a selector name and a long public-key value to paste). Changes propagate within minutes on most modern DNS providers, though full global propagation can take up to 48 hours.
When you host a funnel, landing page, or membership site on a platform like systeme.io, the platform asks you to point a subdomain (often offer.yoursite.com or pages.yoursite.com) at their servers using a CNAME record. If the CNAME is missing or pointing to the wrong host, the page returns a 404 or a security warning instead of your funnel. This checker confirms the CNAME exists and shows what it currently points to.
You keep the domain at your existing registrar (GoDaddy, Namecheap, Cloudflare, whoever). Inside systeme.io, go to Settings, then Domains, and add your custom domain. systeme.io will show you the exact DNS records to copy into your registrar's DNS panel: two CNAMEs to load your funnels, pages, and courses on the domain, plus three more CNAMEs and a DMARC TXT record if you also want to send email from the domain. Propagation is usually instant on Cloudflare and within minutes on most registrars. You can verify each record using this checker before going live.
No. This tool queries one DNS resolver (Cloudflare's public DNS-over-HTTPS endpoint) to give you a fast pass or fail. For propagation across regions, use a tool like dnschecker.org that polls dozens of resolvers worldwide. The two are complementary: this checker tells you whether the record exists and is well-formed; propagation checkers tell you how widely it has spread.
Yes. All checks run from your browser directly to Cloudflare's public DNS resolver. Nothing about the domain you check is stored on systeme.io's servers, and there is no signup required.
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