The SpamAssassin spam filter includes a rule defining any year past 2009 as "grossly in the future," resulting in an addition of 3.2 to the message's spam score.

"The default threshold for spam is 5.0, so the error makes it much more likely that legitimate mail will be falsely marked as spam," according to The H Security.

"SpamAssassin users will need to run the sa-update command to update their rule set. If they are unable to do this, for whatever reason, then adding score FH_DATE_PAST_20XX 0.0 to the local.cf file will work around the problem."

Click here to read the article at The H Security.