A debouncer typically employs several methods to verify email addresses:
1. Syntax Check: Ensures that the email address follows the standard format. 2. Domain Validation: Confirms that the domain (e.g., gmail.com) is valid and exists. 3. MX Record Check: Verifies that the domain has mail exchange (MX) records, indicating it can receive emails. 4. SMTP Authentication: Connects to the mail server to verify whether the email address exists and can receive emails. 5. Blacklist Screening: Checks if the email address is on any known blacklists.