Mail Safety

Letter From an Unknown Sender? A 4-Step Decision Path

A structured way to decide whether to open, ignore, or report a letter from an unfamiliar PO Box, with FTC and USPIS sources for every safety step.

What the Dept number above a PO Box return address actually is, why one box can carry several, and how to search past it to find the sender.

Free and paid ways to identify who mails from a PO Box, the USPS Boxholder Request explained, and what to do when a search comes up empty.

Letter From an Unknown Sender? A 4-Step Decision Path
A structured way to decide whether to open, ignore, or report a letter from an unfamiliar PO Box, with FTC and USPIS sources for every safety step.
What “Dept” Means on a PO Box Address
What the Dept number above a PO Box return address actually is, why one box can carry several, and how to search past it to find the sender.
How to Find Out Who Owns a PO Box
Free and paid ways to identify who mails from a PO Box, the USPS Boxholder Request explained, and what to do when a search comes up empty.
PO Box 13337 Philadelphia PA 19101: Who Is It?
You just pulled a letter from your mailbox. The return address reads PO Box 13337 Philadelphia PA 19101. Now you
Dept 688 PO Box 4115: Who Is This Company?
Have you ever received a strange letter from Dept 688 PO Box 4115? If so, you are not alone. Thousands