SpamAssassin Rule: FH_DATE_PAST_20XX
Standard description: The date is grossly in the future.
The rule matches the year (a string of four numbers) in the Date header, and checks if it is between 2010/2020 (depending on version) and 2099.
The default scores for this rule can be found in the online list of tests.
If you need to disable this test manually, place the following in your local.cf file:
score FH_DATE_PAST_20XX 0.0
Note that this test is still in the default ruleset, albeit set to trigger after 2020. That's a short-term fix; the long-term fix is being worked on in this Bugzilla item.