An unsolicited email message, mailing list posting, or newsgroup posting, often sent for advertising purposes. Spamming, the act of disseminating spam, is considered to be bad netiquette because it can tie up mail servers and networks and clog up recipients’ mailboxes and is generally considered to be an abuse of the underlying ethos of the Internet.

1. Unsolicited commercial bulk email. 2. An email message identified as spam by Symantec Brightmail Gateway, using its filters.