Security

The Spam module provides numerous tools to auto-detect and deal with spam content that is posted to your site, without having to rely on third-party services.

The Spam module provides a trainable Bayesian filter, automatic learning of spammer URLs, flagging of content with an excessive number of links, the ability to create custom filters, and more.

[UPDATE: 1.2 was not correct as some of the hooks would not get defined. More or less, that means some of the functionality would not work properly. Please upgrade to 1.3 to fix the problem. See #1222546: The List of Spam Comments is Broken and #1298480: "Mark as Spam" and "Mark as Not Spam" links for comments going to 404 page. among other similar bug reports.]

Access control for user roles based on taxonomy categories (vocabulary, terms).

Add challenge-response tests to user-facing forms on your site to protect against spambot submissions. Other CAPTCHA types are supported via additional modules.