SpamAssassinの仕事ぶり

SpamAssassinは本当にいい仕事をしてくれる。たとえば、今のところの最大ポイントである28.4を記録した「Medically proven way to increase your penls size. Must read. No pills or patches needed.」なるサブジェクトのSPAMメールに追記されたワーニングは、こんな感じ。

Content analysis details:   (28.4 points, 7.0 required)
   
 pts rule name              description
---- ---------------------- --------------------------------------------------
 0.5 X_MSMAIL_PRIORITY_HIGH Sent with 'X-Msmail-Priority' set to high
 0.5 X_PRIORITY_HIGH        Sent with 'X-Priority' set to high
 0.1 X_MAILER_PRESENT       exists:X-Mailer
 5.4 INVALID_DATE           Invalid Date: header (not RFC 2822)
 1.1 PENIS_ENLARGE          BODY: Information on getting larger penis/breasts
 1.7 MARKETING_PARTNERS     BODY: Claims you registered with a partner
 0.6 HTML_WEB_BUGS          BODY: Image tag intended to identify you
 0.8 HTML_30_40             BODY: Message is 30% to 40% HTML
 4.0 MIME_HTML_ONLY         BODY: Message only has text/html MIME parts
 0.0 HTML_MESSAGE           BODY: HTML included in message
 0.1 HTML_LINK_CLICK_HERE   BODY: HTML link text says "click here"
 1.7 HTML_IMAGE_ONLY_06     BODY: HTML: images with 400-600 bytes of words
 0.7 MIME_HTML_NO_CHARSET   RAW: Message text in HTML without charset
 0.2 HTTP_WITH_EMAIL_IN_URL URI: 'remove' URL contains an email address
 4.0 PORN_4                 URI: URL uses words/phrases which indicate porn
 0.5 FORGED_YAHOO_RCVD      'From' yahoo.com does not match 'Received' headers
 2.4 DATE_IN_FUTURE_96_XX   Date: is 96 hours or more after Received: date
 0.1 MISSING_OUTLOOK_NAME   Message looks like Outlook, but isn't
 1.2 MISSING_MIMEOLE        Message has X-MSMail-Priority, but no X-MimeOLE
 1.0 CLICK_BELOW            Asks you to click below
 1.9 MIME_HEADER_CTYPE_ONLY 'Content-Type' found without required MIME headers

現在はNG WORDチェックを外しているため1日に大体200通ぐらいのSPAMが届くのだが、SPAM判定漏れ（7ポイント未満）は3通程度しかない。その逆に、SPAMじゃないのにそう判定してしまった例も1通。それが日○旅行からのメールニュースだったりするのが、まぁ興味深いところか。