At 10:01 AM 6/2/2003 +0100, Paul Hutchings wrote:
As subject really, one of my users had something tagged falsely, this alone
gave it 4.3 and I'm not sure exactly what it is/does?

List-Unsubscribe is a standardized header. Since List-Unsubscribe is a RFC standard, X-List-Unsubscribe isn't really proper form, as the prefix of X indicates that it is a "nonstandard header". However, some spammers are generating it while trying to fake a legitimate mailing list. All legitimate mailing lists _should_ have been using the standard header a LONG time ago... (RFC 2369 standardized this in July of 1998.)


Take a look at the corpus statistics for spam and nonspam hits on this rule, and you'll see why it scored so strongly.

OVERALL%   SPAM%     HAM%     S/O    RANK   SCORE  NAME
1.577   3.6029   0.0008    1.000   0.95    4.40  X_LIST_UNSUBSCRIBE



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