smf-grey is a Sendmail plugin that incorporates the GreyList Anti SPAM technique.
More specifically, smf-grey is based on a highly effective algorithm that uses a sender's IP address, C class subnet, and envelope information to identify and filter out potential spam and viruses. And if you really want to maximize the impact, it's recommended that you use smf-grey in combination with two other milters: smf-zombie and smf-spf.
Beyond its powerful filtering capabilities, smf-grey is designed to be lightweight, reliable, and easy to use. It's written in C, which means it's both fast and stable, and it requires minimal system resources to run smoothly.
Some of the key features of smf-grey include the ability to whitelist hosts and networks, an autowhitelist for added convenience, and the option to add GreyList results to scanned messages. Plus, all milter activities are logged through the handy syslog service.
Overall, smf-grey is an excellent choice for anyone looking to get serious about filtering out spam and viruses. And with the latest release, which includes auto reloading for whitelists and regular dumping of autowhitelisted records, it's more powerful than ever before.
Version 2.1.0: N/A