This.

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Source: http://xkcd.com/1279/

Hey, gturpins! You keep signing up for things using my email address. Stop it. I’m tired of getting email about your magazine subscriptions, visits to the mechanic, trips to Disney World, medical equipment purchases, password resets, doctor visits and so on. Do you realize that some of these messages contain personally identifiable information that could be used to defraud you? Lucky for you, I delete them. But you’d be safer if you could remember your own email address.