Email Address Verification Online

This tool verifies an email address through multiple steps: syntax check, domain existence, MX records, and SMTP verification — without sending an actual email.

How Email Verification Works

• Syntax: checks conformance to RFC 5322 format.
• Domain: checks that the domain exists (DNS A or MX records).
• Disposable: checks against a list of known temporary mail services.
• MX records: identifies the mail servers for the domain.
• SMTP: connects to the MX server on port 25 and performs EHLO → MAIL FROM → RCPT TO.

Why SMTP Verification Is Not Always Accurate

Many major providers (Gmail, Outlook, Yahoo, Mail.ru) use catch-all or block VRFY/RCPT to protect privacy. A 250 response does not guarantee the mailbox exists; a 550 does not guarantee it doesn't.

Why Verify Email Addresses?

• Clean mailing lists to reduce bounce rate;
• Validate addresses at sign-up to prevent fake registrations;
• Detect disposable/throwaway addresses;
• Confirm deliverability before sending an important message.