Spam Prevention

Badbot is a spam-prevention tool (compatible with all forms on the site). It works by requiring the client to have JavaScript support, throwing an error when JS support is not present. Spam bots cannot handle JS, so this goes a long way towards blocking them without displaying pesky (and unreliable) captchas.

There is a detailed explanation available of this module's specifics.

How to use:

Use http://api.yandex.ru/cleanweb for check spam.

Port sandbox to D7

Poured by the massive spammers attack? Your comment approval queue is overloaded with thousands of spamming comments? Kill them, simply delete all your comments approval queue with spam killer.

Regcheck is a super lightweight and simple module that adds a hidden checkbox on the user registration form, and kills the registration process if it is checked. This is an easy way of keeping registration open on your site while still being protected from robot users.

Just download and enable the module to utilize its functionality.

Are you looking for a way to specify a no-reply email address for all mail coming from your Drupal site without having to muck around with the MTA configuration on your server? You might think, "Oh, I'll just go change the site email address in Drupal." Unfortunately, Drupal sends important notices such as user registration to that email address, so if you change it to a noreply address, you will no longer receive those notices. By default, many contributed modules such as Backup & Migrate and Mollom use this address as well.

Module provide protection against all spam-bots without JS processing

Overview

This module displays a comments IP address in the comment overview page and allows you the option to "Delete the selected comments and block their IP's" from the comment overview dropdown list.

Want to guard against spam? Want to make sure sensitive information isn't easily nabbed by an automated script?

Use Enkoder for Drupal! This uses the logic behind Hivelogic's Enkoder to encode any field or arbitrary text in a recursively self-evaluating block of javascript, foiling all but the hardiest of spambots.

You can use this to harden any text-based field and this module also exposes a general-purpose php function (sclib_enkoder) for your own custom uses.

This module is aimed to call external Spam Databases in order to have information on the new users who are registering on your site.