If you run an older version of Mdaemon 10.x (email server) then you may find this “error message” in the SMTP logs; “The date is grossly in the future”, this is caused by a bug in Spamassassin one of the antispam solutions used by Mdaemon, the problem is that this caused the spam score to get rather high and may cause Mdaemon to discard legitimate mails as spam.
You can ofcause upgrade your Mdaemon installation, but if for some reason you prefer not to do so this is the workaround;
The workaround(besides paying for updates), is to edit the rule-set.
C:\MDaemon\SpamAssassin\rules\local.cf
Add the following line score
FH_DATE_PAST_20XX 0.0
Restart Spam Engine
Curtesy of; http://www.ninjahdev.com/node/8
Just found another tip, change the end of this line to the latter (both solutions should work);
MDaemon\SpamAssasin\default_rules\72_active.cf:
{ FH_DATE_PAST_20XX header FH_DATE_PAST_20XX Date =
~ /20[1-9][0-9]/ [if-unset: 2006]
Change to;
/20[2-9][0-9]