Recently, I’ve been seeing more and more reports of users saying that good email are getting marked as spam. This issue is due to a bug in SpamAssassin that treats dates past 20xx as far future dates. Fortunately, you can easily update your spam assassin rules to fix this issue.
The bug causes emails with a date of 2010 to be hit with a higher spam score by 3.2 points. As a result, these emails could get blocked.
If your SpamAssassin install adds headers, you can see this as a:
To correct this issue, you can run:
Which should pull down the latest SpamAssassin rules. This works on SpamAssassin version 3.2 and above.
By default, Plesk does not automatically update SpamAssassin rules. There is a cron job in:
But by default it is disabled. On Plesk servers, you may want to modify:
Instead of the default SpamAssassin start up script.