Q-Mail Max Rcpt Patch allows you to set a limit on how many recipients are specified for any one email message. RFC 2821 section 18.104.22.168 says that an MTA must allow at least 100 recipients for each message, but may elect not to allow any more than that. Choosing to enforce this limit can help mitigate damage from one of the favorite tricks of the spammer.
RainCaptcha is a CAPTCHA class that does not require any image processing extensions (GD, ImageMagick, etc). CAPTCHA was developed to be readable by humans and resistant to OCR software. It generates black-and-white images with 5 distorted letters on them and noise. Its checking algorithm is case-insensitive.
Collax Groupware Suite is a complete collaboration, e-mail, and messaging server with Outlook MAPI support. It offers enterprise email server functions, anti-spam and anti-virus filters, GUI management, a file server for SMB, NFS, FTP, and Apple shares, backup/restore server, IM server, and fax and SMS server. The groupware offers AJAX Web mail, calendar, team calendar, contacts, and tasks, and supports ActiveSync for mobile devices. It is free for private or commercial use of up to five users.
ExtraWatch is a real-time counter and live stats module for Joomla!, Wordpress, Drupal, Magento, and Prestashop. It allows you to view information about your visitors and bots in real-time from the administration back-end. It details IP addresses, countries of origin, geographical location, which pages they are viewing, and browser and operating system. It creates daily and all-time stats from these data plus unique, pageload, and total hits statistics. Furthermore, you can block harmful IP addresses, see blocked attempts, evaluate trend charts, and create goals based on many parameters. In the front-end, it displays top countries, and user and visit information for certain periods of time.