Spam Prevention

Add the X-Originating-IP header to all outgoing emails to assist with investigation of the sources for spam and unsolicited bulk email.

A standard Drupal install sends email as if it was originating from the web server when in fact, the email originated with a person's web browser. Use this module to include information in the outgoing email header about the IP address of the person who submitted a request to a Drupal website.

This module will find spam present on your site.
Work in progress...

This module provides graceful email obfuscation to protect email addresses from harvesting bots on mailto links generated by the Drupal l() function by obfuscating email addresses found in mailto links and its link text. A RC4 ciphertext of the original email address are saved and is later decrypted and reinserted back to HTML by Javascript, providing a transparent experience to sites where a majority of users are using a Javascript-enabled browser, at the same time prevents non-Javascript capable bots (which at the time of writing, are the majority of the bots out there) from harvesting email addresses.

We make good use of the RC4 stream cipher for saving and restoring plain text email addresses, hence "RC4 email".

Overview

PredictionIO is an open source Machine Learning Server. It empowers programmers and data engineers to build smart applications. Machine Learning is about attempting to teach computers to predict future, or otherwise unknown events, by applying computer science or statistics techniques to analyze existing data. It can be seen as a transformation from existing data to improve insights about the unknown. PredictionIO is useful for any web and mobile apps.

Anti spam module by CleanTalk to protect your Drupal sites from spam bot registration and spam comments publications thru comment and contact forms.

Invisible antispam without CAPTCHA, questions, puzzles, counting animals, math and etc. Just install and forget.

CleanTalk is a SaaS spam protection service for Web-sites.

CleanTalk uses protection methods which are invisible for site visitors.
Using CleanTalk eliminates needs in CAPTCHA, questions and answers, and other methods of protection, complicating the exchange of information on the site.

Module is tested and ready to protect against spam bots for Webform.

This is a tiny module essentially to fight against the spam comments

It does the following,

• Removes all unapproved comment on cron run when the time limit set for approving is crossed
• Allows manually deleting of all unapproved comments of a given node from separate tab (configurable per content type)
• Disables "Homepage" field in comment form (if configured)

Overview

Invisible antispam protection using Sblam service or self-hosted Sblam server.

Allow site admins to run http://mollom.com/ over a batch of existing comments.

A christmas present for Tris Acatrinei.

A simple module for managing active user sessions.

If you have the spambot module enabled it also flags whether the active user is a potential spam account.

Currently exposes a table listing active users with links to kill a users session or block the active user.