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Subject [Bug 6065] New: SUBJ_RE_NUM triggers false positives - should be removed
Date Sat, 14 Feb 2009 19:02:44 GMT

           Summary: SUBJ_RE_NUM triggers false positives - should be removed
           Product: Spamassassin
           Version: 3.2.5
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P5
         Component: Rules

SUBJ_RE_NUM raises false positives and should be removed. This rule checks the
number after “Re” in subject, and if there is a number, e.g. “Re[5]:
Antivirus” and no “X-Mailer: The Bat!” header, this rule is triggered. 

In The Bat!, both “Re numbering” and “X-Mailer” options are
configurable in the program interface, and the user is able to independently
switch them on and off, which creates false positives.

I receive a lot of messages from The Bat! users and this rule bothers me
significantly. Problem is that a number of Internet service providers claim
that The Bat! is a spamming tool and, on that basis, block messages containing
"The Bat!" in an X-mailer header. That's why the legitimate users of The Bat!
have configured to not include the X-mailer into the messages, which, in its
turn, triggers the SUBJ_RE_NUM.

Another reason to drop the SUBJ_RE_NUM is that somebody may use an e-mail
client (say, "A-Mail") that does not change subject on reply, and when the user
of A-Mail will reply to a message from The Bat! with "Re[3]:", SpamAssassin
will raise a false positive.

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