We need a solution to grab the new email address of the user. Currently it is pi

We need a solution to grab the new email address of the user. Currently it is picking old email address of the user example abc@myworld.com and it should pick or the grab the new email address like abc@myworldwide.com
Currently in our process model we pick email address from process variable which picks the old email address. What we required some expression which will grab the new email address of the user.
Could anyone let me know how it can be done. I have created a new expression rule which will search the user the firstname and lastname and pick the email address but only picking the old email address here. We need to pick/grab the other email address of the user like if user old email is abc@myworld.com than it should pick the new email address abc@myworldwide.com
=rule!prmFormatUserAsEmailAddress()
=if(and(not(rule!APN_isEmpty(ri!user)),isusernametaken(ri!user)),user(touser(ri!user),"firstName") & " " & user(touser(ri!user),"lastName"),"NA")
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OriginalPostID-145386

OriginalPostID-145386