Company Setup, Email Server tab
Company Setup, Email Server tab is under System Manager ⇒ HRPro Setup, Company Setup
See How to define Email Server (SMTP Server) in HRPro? for various SMTP Settings.
Click the Clear button to clear the SMTP Settings.
Click the Test Email button to test the settings, if the settings are correct, you will receive a testing email on the mailbox of the Sender Email.