score low on spam setups.

They use them to check the messages they send and adjust them to be "good" messages all the time.

They are using a myriad of techniques, even I get about 8-10 messages a day, in my inbox that are SPAM.

Though I also get about 200 that are moved directly to my SPAM-Box... for review.

I have been getting about 10 valid messages a day now that I have unsubscribed from most mailing lists.