SpamAssassin Rule: DATE_IN_FUTURE_24_48
Standard description: Date: is 24 to 48 hours after Received: date
The Date header is normally set to the date that a message was created. In this case, this date is 1 to 2 days later than the message was received, suggesting that either the message was generated by badly-written mailout software, or the sender's computer clock is very wrong.
The default scores for this rule can be found in the online list of tests.