> I was *definitely* kidding. That'd be way more work than simply emptying
> my spam folder, and gmail catches 95% of the crap without me doing
> anything anyway. I get more spam at work - where they use an Exchange
> server and have fancy expensive software to filter out spam - than I do
> in my gmail inbox.

That's because Google has such a huge volume of data (everyone who uses
Gmail's email content), that it's much easier for them to determine what
is spam and what is not. Since you can flag stuff as spam (which I
presume you can), this method is even more effective than simple
rules-based spam filters, since an actual human is reading the email and
saying "this is spam". Therefore, one can infer that all other email in
the system of a similar nature to that email is also spam.

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