With bigger companies you also have to worry about the content of the messages. Yes, online gambling will probably not offend an employee, but requests from forms of a more questionable content can be construed as "harassment" if the employer does absolutely nothing to stop it. Of course that is more of a business concern and less a technical matter, but still one of the concerns behind the implementation of Captchas. It also reduces the "annoyances" that public facing, non-login form can produce. Untill be have an international "identity" system - Captchas and email confirmation (like click here to activate your account) will increase in use -- a necessary evil at the moment.
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