[Koha] Primary & secondary email addresses

Does anyone know how Koha (3.04.02) handles emailed notices when there is a secondary email address, but no primary address? My suspicion is that no notice is sent out & the notice is bundled into the compiled "Overdue Notices" message to the admin for patrons w/out addresses ... Cheers, Cab Vinton, Director Sanbornton Public Library Sanbornton, NH "Politeness and consideration for others is like investing pennies and getting dollars back." Thomas Sowell