Are the spam filter settings too weak?
X-Spam-Status: No, hits=2.8 required=4.0 tests=FORGED_YAHOO_RCVD,
RCVD_IN_BL_SPAMCOP_NET,RCVD_IN_SORBS autolearn=no
version=2.60-lists.debian.org_2003_12_03
Shouldn't the combination of a forged yahoo header and hits in two separate blacklists be enough to trigger a spam "yes" status?
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Björn