[Koha] Librarian email address

hi all, i have our system (Koha 3.0) set to email the Librarian when a hold is placed, however i can't find where to define the email address it should use. this is separate form the "system notifications" email address defined in the system preferences. i'm sure it's user error here ... does anyone have any idea what i need to do. thanks in advance! -ss shane skeens