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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