Syntax, DNS, disposable domains, role accounts, SMTP mailbox checks, and catch-all detection—behind one reliable API.
No card required · API key in under a minute
Verification result
Completed in 1.8 seconds
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How MailCheckr works
A clear, four-part path from your first lookup to a decision—without pretending every inbox can be proven reachable.
Check one email in the dashboard or API, or upload a CSV when you have a whole list.
MailCheckr checks syntax and mail-routing records, then looks for disposable domains and role-based addresses.
When SMTP checking is available, a mailbox probe and catch-all check add evidence. Servers that do not give a clear answer stay unknown.
Get a deliverable, undeliverable, risky, or unknown status with its reason. Review it in the dashboard, use the API response, or export your CSV results.
Free domain tools
Explore published authentication policies, mail routes, and DNS records—one focused lookup at a time.
Review a domain’s DMARC policy and see how it handles mail that fails authentication.
Inspect which mail servers a domain authorizes to send on its behalf.
Look up a DKIM public key using a domain and selector to review signing setup.
Follow a hostname’s alias to its destination and check the published record.
See the mail exchangers and priorities published for a domain.
Explore the public DNS records behind a domain in one place.
Frequently asked questions
Know what MailCheckr can tell you, where the evidence has limits, and how to use the result.
It checks the address format, the domain’s mail-routing records, disposable-domain and role-account signals, and—when available—SMTP mailbox and catch-all evidence. The result includes a status and reason so you can see what informed it.
No. A verification is a point-in-time assessment, not a delivery guarantee. A mailbox can change, and spam filtering, sender reputation, or recipient rules can still affect a real message.
Some mail servers hide mailbox information, temporarily reject probes, or do not give a clear response. MailCheckr keeps those cases unknown rather than calling an address valid or invalid without enough evidence.
Yes. Upload a CSV in the dashboard to process a list, follow its progress, and export the results when you are ready.
No. The DMARC, SPF, DKIM, CNAME, MX, and DNS tools show public records for a domain. They help you inspect configuration, but they do not determine whether a specific inbox can receive mail.
Yes. Create an API key to submit verifications and receive structured results with the status, reason, and individual checks. The dashboard is also available for manual use.
