Syntax Check: This step ensures that email addresses follow the correct format. Domain Check: Verifies whether the domain of the email address is valid and active. Mailbox Check: Confirms that the specific mailbox exists and can receive emails. Role-Based Account Detection: Identifies addresses that belong to role-based accounts like info@domain.com or support@domain.com, which may not be ideal for marketing emails. Spam Trap Detection: Identifies email addresses that are used to trap spammers, helping you avoid potential issues.