There are no such packages that you can not refuse to accept. However, some items do not qualify for the free return shipping to sender option. It means you will have to pay to have these mail packages returned to their sender. These items are:   ●  Certified Mail, COD, Insured Mail, Registered Mail, Return Receipt for Merchandise Mail, or other signature mail are not eligible for free postal return. ●  Any response mail to sales announcement, promotion, solicitation, or other advertisements not refused at the time of offering also doesn't qualify for free return.