What exactly is this "shark account" referred to below.

The "trick" involves the creation of a bogus "!0000"
or "0000" contact in your email address book.

Email administrators have long used "shark accounts" to "gobble up"
messages sent accidentally to the first contact in a corporate email
address book. To the best of our knowledge, email administrators do
not use this "trick" to deter virus proliferation.

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