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A new (extra) prefix, "[Spam]" started appearing in some email subject lines. This is in addition to the spam filter prefixes explicitly configured by us ( Spam-Low, Spam-Med, Spam-High). It is being inserted in the subject before the expected prefixes are and started showing up a few months ago. There is no explicit filter that I can find that is set to add that extra prefix. It seems to be independently weighted from the expected prefixes because it will show up alone or in addition to the expected prefixes. Sometimes the expected prefixes will appear without the extra (new) one.
Sample Subject:" Spam-Low: [Spam] :Special upgrade price...."
Running SM 12.3 w/ Cyren AntiSpam