Related Clues:
- It's signed, sealed and delivered
- Junk __
- Postal Service delivery
- Inbox stuff
- Mother not well missing little metallic dress of armour
- It may be registered or certified
- Postal letters
- Some airplane cargo
- Armor of a sort
- Armour of interlinked metal rings
- With 97-Across, like many catalogues
- Grocery load
- Letters, catalogs, etc
- Letter distribution on a base
- "Junk" that goes third-class