spam bait n.

Email addresses included in, or comprising the entirety of, a Usenet message so that spammers mining a newsgroup with an address harvester will collect them. These addresses can be people who have offended or annoyed the poster, or who are included so that a spammer will spam an official, thereby causing himself trouble. One particularly effective form of spam bait is the address of a teergrube.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.