How typo detection works
The product is designed to detect common misspellings of Gmail, Hotmail, Outlook and Yahoo, plus malformed email endings and common TLD errors. The website demo illustrates the gmial.com correction only; it is not the full plugin engine.
A typo suggestion does not prove that an address exists, belongs to the person entering it, or can receive email. It is not an inbox-verification or deliverability service.