junk mail

• junkmail

junk mail (countable and uncountable, plural junk mails)

2. (post) Any mail or letters that are not welcome or solicited and typically sent in bulk; especially mail of a commercial nature such as advertising circulars and form letters.
   • 1988 December 14, Stephen Wyatt, “The Greatest Show in the Galaxy Part 1”, in Doctor Who, spoken by Dorothy ("Ace") McShane (Sophie Aldred):

     I don't believe it. Junk mail that talks back.

   • 2013 May 25, “No hiding place”, in The Economist‎^[1], volume 407, number 8837, page 74:

     In America alone, people spent $170 billion on “direct marketing”—junk mail of both the physical and electronic varieties—last year. Yet of those who received unsolicited adverts through the post, only 3% bought anything as a result.

• junk mailer

• admail
• advertising mail
• direct mail

• spam
• UCE

•   junk mail on Wikipedia.Wikipedia