Related Clues:
- Pigeonhole filler
- System that was called 34-Across before the Internet
- Suit of armour
- Pony Express concern
- Bills, catalogs, etc
- Six-day-a-week delivery
- Much of it is junk
- Six-day-per-week delivery
- Irishman, maybe, turned up for post
- What was the man of letters expecting - to be slung out of Mulligans?
- *Old-school letters
- Contents of AOL folders
- Six-day-a-week delivery, slangily
- Stamped delivery
- Delivery by USPS