MX & Email Deliverability Checker
Check a domain's MX records, SPF record, and DMARC policy, with an optional DKIM selector lookup. Free, no account needed.
3 free checks per day. No signup needed.
What this checks, and what it can't
MX, SPF, and DMARC all live at well-known, discoverable DNS locations, so this tool checks all three automatically. DKIM doesn't, it lives at a subdomain named by whichever email provider set it up, so DKIM is only checked when you provide that selector. If you don't know it, your email provider's setup documentation will have it, this tool won't guess and report a false "not found."
Frequently asked
What are SPF, DKIM, and DMARC?
SPF lists which servers can send mail for a domain. DKIM digitally signs outgoing mail. DMARC tells receivers what to do when a message fails those checks. Together they're the standard defense against email spoofing.
Why do I need to provide a DKIM selector?
A DKIM record lives at a subdomain chosen by whichever email provider set it up, like google._domainkey.example.com, with no standard place to find it without that selector name. Check your provider's setup docs for the exact one they use.
What does a DMARC policy of none, quarantine, or reject mean?
none delivers failing messages as normal, only reporting. quarantine sends them to spam. reject blocks them outright. Most domains start at none, then move to quarantine and eventually reject as confidence grows.
Related tools: DNS Lookup ·DNS Propagation Checker