Answer: junkmail

AnswerCrossword Clue
JUNKMAIL

Scrap armor?

JUNKMAIL

Inbox clutter

JUNKMAIL

Many ad circulars

JUNKMAIL
Letters for occupants?
JUNKMAIL
Advertising addressed to "Occupant"
JUNKMAILSome letters.
JUNKMAILPost office onslaught