OK, so I haven't upgraded spamassassin for a while, just distro updates. 
I just learned it has been throwing out many emails dated 2010 . 
Fortunately, there is an easy fix:

In /usr/share/spamassassin/72_active.cf :

-----------------------------------------------------------------------
##{ FH_DATE_PAST_20XX
header   FH_DATE_PAST_20XX      Date =~ /20[1-9][0-9]/ [if-unset: 2006]^M
describe FH_DATE_PAST_20XX      The date is grossly in the future.^M
##} FH_DATE_PAST_20XX
-----------------------------------------------------------------------

The header line should be:
-----------------------------------------------------------------------
header   FH_DATE_PAST_20XX      Date =~ /20[0-9][0-9]/ [if-unset: 2006]^M
-----------------------------------------------------------------------

No time to do much more with that; if someone else wants to track this
down, see how prevalent it is, submit a bug report, etc. that would
help us all.   I've got about 8 days of unanswered emails to deal with!

Keith

-- 
Keith Lofstrom          [log in to unmask]         Voice (503)-520-1993
KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs