PORTERS provides a feature that allows you to send emails from addresses other than the email address used for login. However, when sending emails via Gmail, you must grant permission in Gmail in order to send emails from an address other than the authenticated account.
Please review this manual and configure the settings accordingly.
Note: “HRBC” is the former name of “PORTERS.” Please read any references to “HRBC” in the documentation as “PORTERS.”