Enter a clue or pattern or both:
The Clue
Letter box deposits (6 letter answer)
The Answer
USMAIL
Tags
Notes
The answer USMAIL is rarely seen, appearing only about once every 1500 puzzles.
Related Clues
Daily delivery
FedEx alternative
Letters in - or on - boxes
Inscription on a letter box
Pony Express bundle
Words below an eagle
Inscription on a classic letter box
Label on a street-corner box