check-if-email-exists
lets you check if an email address exists without
sending any email.
Under the hood, it connects to the email address's SMTP server, and, analyzing the server's responses against some SMTP commands, finds out information about the email address, such as:
- Email deliverability: Is an email sent to this address deliverable?
- Syntax validation. Is the address syntactically valid?
- DNS records validation. Does the domain of the email address have valid MX DNS records?
- Disposable email address (DEA) validation. Is the address provided by a known disposable email address provider?
- SMTP server validation. Can the mail exchanger of the email address domain be contacted successfully?
- Mailbox disabled. Has this email address been disabled by the email provider?
- Full inbox. Is the inbox of this mailbox full?
- Catch-all address. Is this email address a catch-all address?
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