WORKFLOW:How to send emails to varible names

Hi All,

I have an issue that I wan to send emails from workflow, but sender(SAP USERNAME) is as a variable in the workflow container.

So how to send emails to that variable name(That is SAP username) instead of workflow initiator.

And other thing I have tried with option sap user name but its taking only a constant so i cant put variables there..

Thank you,

Pathum.