This is a procmail software named "Yet Another antiVirus Recipe" that can filter out many common email worms.
One of the key features is the use of base64 signatures to locate MS-Windows executables that have been encoded within emails. These attachments are then placed into a separate directory (/virus/) for easy sorting and removal.
Yet Another antiVirus Recipe is also capable of detecting dangerous file types that are being disguised as innocent files, such as JPG or WAV. Through the use of warnings and headers, you can easily identify and remove these threats from your inbox.
Additional security measures include generic detection for most of Nigeria scam e-mails, an issue that is not necessarily a virus but causes a significant spam problem nonetheless. Users can also choose to quarantine certain emails with new switches now available in the latest release.
Overall, I was impressed with Yet Another antiVirus Recipe's capabilities and found it to be a valuable addition to my email security. The addition of X-marks in headers also makes it easy to create custom procmail scripts for even greater email protection.
Version 1.9.5: N/A