Verify an email address
Type one email address. It is checked for format, disposable domains and mail servers, then the mail server is asked whether the mailbox exists and whether it accepts every address (catch-all). Nothing is sent. Free, no account.
What the result means
Nothing checked yet. Type an address above.
Type an email address to check its format, domain and mailbox. 3 free checks a day, no account.
| Result | Meaning |
|---|---|
| Deliverable | The mail server confirmed the mailbox exists and rejected a made-up address at the same domain. |
| Catch-all: cannot be confirmed | The server accepted a made-up address too, so it says yes to everything. Send with care; it may bounce. |
| Unknown | The server would not say, or the provider hides mailbox status (Outlook, Hotmail and iCloud do). |
| Undeliverable | Bad format, a disposable domain, no mail server, or the server said the mailbox does not exist. |
For comparison: of the 58,419 business emails 67Leads holds, 7,056 (12%) were confirmed by the mail server the same way and 7,355 (13%) are on catch-all domains, as of 9 Nov 2026.
This page checks 3 addresses a day. SimpleVerifier, our sister email verifier, checks lists in bulk from a file.
Verify a list with SimpleVerifierHow the check works
- Format: one @, allowed characters, a real domain ending, and not a placeholder such as test@ or an example domain.
- Disposable domain: checked against 8,746 throwaway inbox services.
- Mail server: the domain's MX records are looked up. No MX, a domain that does not exist, or a null MX means mail cannot be delivered.
- Catch-all: the mail server is asked about a made-up address at the same domain. If it says yes, it says yes to everything, and no single mailbox can be proven.
- Mailbox: the server is asked whether this exact address exists (an SMTP RCPT TO), then the connection is closed before any message is sent.
The steps are the same rules 67Leads uses to label the emails in its lists verified, catch-all or unverified. Each connection gets 3 checks a day, and every visitor together 300, because each check opens a mail connection from our server. Nothing you type is stored; only a one-way hash of your connection's IP is counted for the daily limit.
Why some results are "unknown"
Microsoft (Outlook, Hotmail, Live) and Apple (iCloud) accept the question for any address, so their mailboxes cannot be checked from outside. Some company servers refuse to answer, or slow down connections they do not know. Those results are shown as unknown, never as deliverable.
SimpleVerifier bulk email verificationEmail permutatorEmail extractorLead list previewGoogle Business Profile auditGoogle Business category mapperEmail blacklist checkerSPF and DMARC checkerReview score checkerBusinesses with no website67Leads pricing
Questions
Type it above. The domain's mail server is asked whether the mailbox exists, and the connection is closed before anything is sent.
One on a domain whose mail server accepts every address, real or not. A verifier cannot prove the mailbox exists, so treat it as risky.
3 a day from one connection, with no account. To verify a list, use SimpleVerifier, our sister email verifier.
Yes. No message is sent and the person is not notified. Only the address's mail server is asked whether it would accept mail for it.
More free tools
Local business counterNo-website business finderLead list previewCold email template generatorFree Google Maps scraper alternativeGoogle Maps rank checkerNAP consistency checkerGoogle Business Profile categories listAll Email deliverability toolsAll tools