Spammers can defeat the registration process of free e-mail services by launching a coordinated bot attack that can sign up for thousands of email accounts. A partial solution to this problem is the use of to ensure that only humans obtain free accounts.

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The Answer of Spammers can defeat the registration process of free e-mail services by launching a coordinated bot attack that can sign up for thousands of email accounts. A partial solution to this problem is the use of to ensure that only humans obtain free accounts.

Spammers Can Defeat the Registration Process of Free E-Mail Services