I have a PHP system which uses 2 pages, the form, and the page2 page, which actually sends the data

I use a timecheck - the time between entering the form, and posting, must be reasonable.

Also, I create a random value, which is passed via session AND post, and if the two don't match, then the email gets sent to a different address, for checking when I can be bothered. It has only dropped one email into the trash in error, and that is because I had a form on the site that I had forgotten about.

Personally, I find captcha annoying to use, so I don't want to inflict it on my visitors.

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Pete Clark
Sunny Southern Spain - http://hotcosta.com/Andalucia.Spain