| latest preview version = | latest preview date = | operating system = Cross-platform | programming language = Perl | genre = Email spam filter | license = Apache License 2.0 | website = http://spamassassin.apache.org }} SpamAssassin's a computer program released under the Apache License 2.0 used for e-mail spam filtering based on content-matching rules. It's now part of the Apache Foundation. SpamAssassin uses a variety of spam-detection techniques, that includes DNS-based and checksum-based… (More on Spamassassin)