Indeed, captcha on this will be a good idea

[url=http://plugins.b2evolution.net/index.php/2007/12/27/turing_test_220]b2evo Plugin Directory - Turing test 220[/url]

"Turing Test is an antispam tool that lets you ask your visitors a question before they can submit a comment. "What color is red" or "Type 'foo' in the box" (which isn't a question but you get the idea). A wrong or missing answer means the visitor has to try again.

Protects comments, message forms, and registration.

(This is an upgrade of an existing plugin for v220)

Thanks John. Will try this. :-)