The email checker validates address format, checks DNS records for the domain, and can test the recipient mail server through SMTP to estimate whether the mailbox is reachable.
MX and domain checks
The tool looks for mail exchange records and basic DNS signals such as SPF, DKIM, and DMARC. Missing DNS records do not always mean the mailbox is invalid, but they can explain delivery problems.
SMTP response
In full mode the service connects to the selected mail server and analyzes the response to the recipient check. Some providers hide mailbox status or use catch-all routing, so the result may be uncertain.
Responsible use
Use the checker for your own lists, support requests, and diagnostics. Large automated checks can trigger mail server limits and should not replace confirmed consent from the recipient.
How the email checker works
Check whether an email address has a valid format, whether the domain has mail DNS records and, when possible, whether the mailbox can receive mail. The tool can use MX and SMTP checks for a practical deliverability estimate.
Use it for signup forms, support requests, contact lists and reducing bounce rates. Some mail servers hide mailbox status or use catch-all rules, so the result should be treated as a diagnostic signal rather than an absolute guarantee.
✓Need to quickly check if an email address really exists before sending a message or campaign?
✓Our online email checker connects to the recipient's mail server and analyzes the SMTP response in real time.
✓This helps reduce bounce rate, clean up contact lists and protect your sender reputation.
✓You do not need to install any software — just enter the address and look at the detailed SMTP session log.
✓Please remember that some servers deliberately hide information, so “unknown” does not always mean that the address is invalid.
✓Use this tool responsibly and do not abuse mass checks in order to respect mail server limits and anti‑spam policies.
