Basically that OOTB activity used to fetch sender email account info which is used as sender email while sending a mail and no need to set those parameters either just enable pass current parameter page and Pega will take care. and If you want to use a particular email account as sender other than default than configure those params and and call the activity.
Thanks for the reply. But I did not get exactly what I want to know (from reply) . Observed that the output of the getSenderEmailInfo is returning those parameters values only. But where those parameters are used in existing activities?
For example getSenderEmailInfo activity used in CorrNew activity. But I did not find the parameters usage which are output of getSenderEmailInfo. Could you find where those parameters are exactly used in one of the OOTB activity in CorrNew instead of considering the all references.