Do you ever wonder how your USPS direct mail gets to your donor’s mailbox? And how you can use best practices to save money on all of your nonprofit USPS direct mail campaigns? Have you ever been to the National Postal Museum in Washington, DC? It’s located right next to Union Station and access is FREE. The museum shows in interactive ways how it all began. You’ll see how people literally risked their lives to make sure that the mail got delivered. From horse to stage coach to trains to planes…