the flag up means that bad guys can come and get it. >> clayton: and packages, too, you can't leave packages unless you're actually-- a lot of people printing at home so that works for both envelopes and packages. and required, get the signature required and too lazy with it and don't want to make sure they're there. but really important to do? >> this is balancing convenience with security. essentially, no signature required, means they can drop it off your door, right at your mailbox, whereas signature required, if you're not at home. you've got to go to the post office and get it. that's the best tip right there. as long as the signature is required, then they have to give it to a human being. >> utilize deluxe security checks, i don't know what they are. >> basically contacting your postal annex will require the post office to pay close attention to your address. i had mail stolen at one point and i contacted the alex and so now, they are--