Postfix 公式で紹介されてるVirus/SPAM content filters Addon のうち…

ほかのプログラムに処理を投げるラッパーでも、正規表現など単なる文字列フィルターでもなく、内容的に判断してフィルターするもの。

PRACTICAL Virus/SPAM content filters

• Cloudmark Authority Milter High performance spam, phishing, and malware protection for your Postfix installation.
• Kaspersky Linux Mail Security system.
• amavisd-new utility, a high-performance interface between MTA and virus/SPAM scanners.
• Dr.Web anti-virus & anti-spam for Telecoms and businesses with heavy mail traffic; available as solution and SDK.
• ClamSMTP content filter based on the ClamAV anti-virus software.
• spampd spam filtering, transparent SMTP/LMTP proxy using SpamAssassin, in Perl by Maxim Paperno.
• mailscanner system, works with Postfix and other MTAs. WARNING: This software uses unsupported methods to manipulate Postfix queue files directly. This will result in corruption or loss of mail. The mailscanner authors have sofar refused to discuss a proper access API or protocol.
• RBL analysis tools by Craig Sanders.