"Unsolicited mail" refers to messages or letters that you receive without requesting or wanting them. It is usually unwanted and often includes advertisements, promotional material, or spam emails. Full definition
Traditionally, the best way to get a bunch of new subscribers is to send millions of pieces of unsolicited mail — junk mail — to people who might have some interest. (treehugger.com)
It protects your personal information from being sold and stops unsolicited mail. (wisebread.com)
We will not sell, share, or rent your personal information to any third party or use your e-mail address for unsolicited mail. (financemagnates.com)