Anti-spam

lastmod 2026-11-10created 2022-03-232 edits

Anti-spam (spam prevention) is the umbrella term for technologies and techniques that filter out unwanted bulk messages, especially spam email and comment spam. Sender blacklists, Bayesian filters, sender authentication such as SPF and DKIM, CAPTCHA, and others are used. Its purpose overlaps with Ad blocking, which blocks ads, but the targets differ.

See also

• Ad blocking