Spam marking begins with something called "Required Hits". The required hits are the total score an email needs to get before it is considered spam. For example, if the subject includes the word "FREE" the score associated with that might be .8. If the return address doesn't have a real name in it the score associated with that might be .5. If you add all the points up, you get the spam score, which in this case would be 1.3
So the "required hits" is the threshold that the total score must exceed before it is considered spam.
The default for the spam filter is 5. Currently our Required Hits is set fairly aggressively at 3.5.
Then there are two more values - sa_delta and sa_delete.
Sa_delete is added to the required hits. Any mail that exceeds that value will be deleted. So if the required hits is 3.5 and the sa_delete is 1 then 3.5 + 1 = 4.5. Anything exceeding 4.5 will be deleted.
Sa_delete is something you set per domain or per email recipient. Currently it is set to 1 for most of your accounts.
Then there is a value called sa_delta. The sa_delta is used to calculate what becomes "LOW", "MEDIUM", or "HIGH" spam according to this formula:
Low = From (Required Hits) to (Required Hits + sa_delta)
Medium = From (Required Hits + sa_delta) to (Required Hits + 2 * sa_delta)
High = greater than (Required Hits + 2 * sa_delta)
So if the "required hits" is 3.5 and the "sa_delta" is one, then the high, medium, low breakdown would be as follows:
Low = 3.5 to 4.5
Medium 4.5 to 5.5
High 5.5 or greater
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