junk mail
Definition
Unsolicited mail sent out usually by direct marketing or direct mail firms. Used mainly for introducing new products, books and magazines, investment opportunities, merchandise catalogs, etc., junk mail is big business in industrialized countries especially the US, UK, and Canada. Unsolicited email is called spam.
News containing the term junk mail
http://www.businessdictionary.com/definition/junk-mail.html

