IP Address whitelisting is a security feature often used for limiting and controlling access only to trusted users, IP whitelisting allows you to create lists of trusted IP addresses or IP ranges from which your users can access your domains.
API IP Validation: On enabling this option iTextPro application validates the configured whitelisted IP address before processing the API request.
Validate IP: On enabling this option iTextPro will validate the source IP Address and will only allow the Whitelisted IP Address to connect with the ESME Account.