PHP Contact form with image verification.
If you use a normal contact form then spammers will fond a way to automatically send junk messages through that form, so you need a way to verify that the sender is an actual person and not an automated script.
A good solution for this is to use an random code that is generated by a script the code will be displayed as an image so only a person could read the image and type the number. This practice is called Captcha image validation. The image also has a noise added to avoid any existent automated scripts that could read the text from the image.
The contact form also makes sure the user filled all the form fields correctly, when all fields are completed and the text entered inside email box is an email address.
The form will contain a link to an image, the link to image is actually a link to a php file generating the image, user will have to fill the image code inside a form field once with the other message contents (subject, sender email, etc) then click submit, if the code in the image will not be correct then message is not sent and user is asked to fill the image code again, the other form fields remain filled.
When form is submitted the data is send to this script that verifies the image code and the email is sent or the user is sent back to fill the form again.
Remember to replace your@email.tld with your own email address in the file mailer.php
Download from here: http://sys-admin.gr/downloads/contact.rar
Originaly taken from: thewebhelp
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