Contact form and 'email a friend' script - Spammers get this?

I am putting a contact form and 'email a friend this info' on a website.  This email a friend, I imagine, would need sender's name, sender's email, recipient's name, recipient's email.  This site is being hosted by Crystal Tech.  Also using a Contact Form.

What are the main security risks for these?  Is a Contact form more secure?

Thanks.
texastwostepAsked:
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jhanceCommented:
One thing that sites are using to prevent the abuse of these sorts of things are the hard to decipher strings displayed as an image that need to be entered as a confirmation code.  By employing one of these you prevent automated abuse of the site to send SPAM.

You might want to look into such a thing.
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texastwostepAuthor Commented:
i can see this for the Contact Us page, but does it seem like overkill to have that on a "send this page to a friend.'  surely there's some other way...
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ahoffmannCommented:
> What are the main security risks for these?  Is a Contact form more secure?
that your form is used as spam relay by automated scripts
one method to prevent this are CAPTCHAs (as jhance suggested)
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