QMailFilter 2.4 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. QMailFilter lies within Communication Tools, more precisely E-mail Tools. This free software is an intellectual property of Quester. We recommend checking the downloaded files with any free antivirus.
From the developer:
QMailFilter is an easy-to-use Microsoft Outlook add-on designed to provide an advanced intelligent protection against spammers, viruses, unsolicited emails and dangerous HTML code (Web-bugs). QMailFilter uses Bayesian filtering technology that identifies about 99% of incoming spam messages and it contains one before-trained filter as basic data base and this trained filter identifies between 90-99% of incoming advertising emails.
You may want to check out more software, such as OLfolders or OLfolders PE, which might be similar to QMailFilter.