Data verification tools typically use a combination of techniques to validate email addresses:
Syntax Check: They verify the format of the email address to ensure it follows the correct syntax. Domain Check: They check the domain of the email address to ensure it is valid and active. Mailbox Check: They ping the email server to confirm that the mailbox exists and is not full. Role-Based Account Detection: They identify role-based accounts like info@ or admin@, which are often less engaged.