Hey all. One of the sysadmins at Mudd, Claire Connelly, pointed out that there's a widespread bug in SpamAssassin that might cause large numbers of false positives on mail sent after 2010-01-01. Apparently, the "date in future" rule is hardcoded to look for years after 2010. You can read more at LWN; the short of it is that you probably want to add the following to your SpamAssassin config:
score FH_DATE_PAST_20XX 0.0
sa-update may or may not be pulling down updated rules. You can find
the relevant bug at the SpamAssassin Bugzilla (#5852). Anyhow,
something fun to be aware of.