I open the show by explaining WHEN outgoing mail gets its postmark dates. It's handled by a machine called the Advanced Facer Canceler System. Then I get into how that machine actually works. Finally, I answer a question from the mailbag about Commercial Mail Receiving Agencies (like the UPS Store), and what we're supposed to do with their mail. This episode kind of gets into the weeds, and that's exactly where Classes of Mail likes to be!