When having having forms on your website one of the most common form fields is usually the user's email. To ensure you're receiving quality information and not receiving bogus spams you should validate the email to be of a real one or close enough to. Here's a quick free email validation script for those PHP lovers.

You're making your website and you have forms. Here you are thinking, what if spam bots found my form? What if somebody submitted to my form from their own script? What should I do? Well, there's many things you can do to mitigate your worries but one of the simpler things you could do is having an image verification field in your form. Here's a basic script to generate a random code in image that bots can't read.