Source: United States Postal Service
There are millions of businesses that use the mail. The vast majority of these have only one to a few person(s) responsible for mail center-type operations. Of these millions of businesses, there are thousands of large, complex corporate mail center operations. The United States Postal Service (USPS) has compiled a summary of best practice procedures that can be used by any mail center.
These recommendations come from businesses that use mail and have been shared with the USPS for distribution to its customers. Since needs and resources are often different, every suggestion may not apply to all businesses. You should determine which are best for your organization and conduct periodic security reviews of operations to identify needed improvements.
The recommendations cover general security concepts such as: