The weight is a value assigned to a spam check
according to its validity and competency. Generally, the higher the weight, the
more likely an email message is spam.
At WDDX each piece of mail is analyzed with over 100 tests. For each test that is failed, a weight is attached. Mail of a certain weight has it's subject line courteously rewritten, so the recipient knows that the message is suspicious. Mail of a certain (much, much higher) weight is automatically deleted.