Unsolicited commercial email is usually referred to as

Unsolicited commercial email sent in bulk is commonly called spam.

Junk is a loose term for unwanted mail but is not the specific word asked for here.

Hoaxes are deliberately false messages meant to deceive, not simply unsolicited advertising.

Hypertext is linked web text and has nothing to do with unwanted email.

Spam clogs inboxes and is filtered by dedicated spam detectors.

The term spam for junk email is popularly linked to a Monty Python sketch.