I keep two email addresses. One is carefully guarded and the other is the one I fill out forms with. In more than five years I haven't had A SINGLE piece of unsolicited email in my inbox in the guarded one. Importantly, I use the junkmail account for all my commerce. When I buy computers for my work I put use my junkmail hotmail account rather than my legitimate work address, even though I'm buying from presumably trustworthy companies like Dell.
The proof is in the pudding -- over five years without one piece of junkmail and no special filtering.
edit: Fascinating. After I wrote that I got thinking, "what the hell is that supposed to mean, 'the proof is in the pudding'? So I googled it and found this:
Perhaps it's a sign of our increasingly fast-paced, short-attention-span society that even our old proverbs are being shortened and clipped down from the original full sayings. Word Detective and other etymology sites pointed out that the phrase originated as "the proof of the pudding is in the eating." It means that the true value or quality of something can only be judged when it's put to use.
That makes a helluva lot more sense.