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You know, Thunderbird is pretty much does the same thing, but you don't pay for it. You train it to see spam, and it throws it automatically in your spam box.
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Sure, exactly. It's called Bayesian filtration, anyone can implement the technology. There are two huge advantages to the site I use, for me.
1) Their filters are already trained with the spam mail from hundreds of users
2) I can access it whenever, wherever.
See, that second point wouldn't be a big deal for a lot of folk. Since I spend an amazing amount of time away from home, it is a huge advantage for me. Whenever I'm actually at home, I do use an email client to access my mailbox. Whenever I'm away I use either my phone, or a web interface.
I value the ability to go mobile and take the spam filter with me. I value it far more than the money I pay out for the service, which really is a negligable amount at $17 per year.
There's nowhere I can't reach.