milter-spamblocker 3.5

milter-spamblocker is a lightweight, reliable and very fast Sendmail milter designed to reject SPAM and Internet worms going from trojaned/infected Windows computers (zombie hosts) around the world.
It blocks up to 99% of SPAM and up to 99.9% of Internet worms. You will not need to pay for the garbage traffic now. Its written in C.
Main features:
- external editable configuration file;
- whitelist by an IP address (in CIDR notation);
- whitelist by a PTR (reverse DNS) record;
- whitelist by an envelope sender email address;
- whitelist by an envelope recipient email address;
- SMTP AUTH support;
- adaptive anti zombie technology;
- real-time sender address verification with an autowhitelist;
- strictly RFC-2821 compliant MX callback engine;
- tolerance against non RFC-2821 compliant email servers;
- blocking of email messages with a spoofed senders email address;
- real-time recipient address verification with authoritative email stores;
- progressive slowdown of recipients email address brute force attacks;
- Sendmail virtusertable and mailertable features full support;
- safe anti bounce / backscatter technology;
- legitimate email messages friendly GreyListing with an autowhitelist;
- blocking of harmful attachments to prevent viruses from spreading;
- persistent cache engine;
- low level of false positives.