API-based validators typically operate through the following steps:
Syntax Check: The API checks if the email address is properly formatted according to standard email syntax rules. Domain Verification: The validator confirms whether the domain of the email address exists and can accept emails. Mail Server Validation: The API pings the mail server to verify if it can receive emails for the specific address. Mailbox Validation: Lastly, the API checks if the mailbox exists and is active.