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Why do certain messages in the message log of my Barracuda Spam Firewall have spam scores of -1001.00?

Solution #00003902

Scope:
All Barracuda Spam Firewalls, all firmware revisions.

Answer:
Users of the Barracuda Spam Firewall may find that some messages are assigned a score of -1001.00 with the reason of "Message Size." A large message size is a leading indicator that a message is not spam; spammers have an empirically demonstrated interest in distributing as many messages as possible in a circumscribed amount of time.

As a result, Barracuda has designed the Barracuda Spam Firewall to assign a message with a size equal to or greater than 150 kilobytes a large negative score to ensure that other scores assigned by the application of other spam rules do not affect its ultimate delivery.

Link to This Page:
http://www.barracuda.com/kb?id=50160000000HYDf