Related Clues:
- Bills, circulars, etc.
- Post office sackful
- Weekday delivery
- It may be junk
- It often contains lots of letters
- It might be four letters
- "You've got __"
- Vacationer's accumulation
- Drop in a letter box
- Postal deliveries
- Letters and such
- Drop in a letterbox
- Letters, collectively
- Drop in a slot
- It's not delivered on Sundays