Client and server side validation
If you have read my proposal , you might find something 'client and server side validation'. What I mean by that is form validation , checking entries for proper content and filtering out spams. Now there are some libraries to do these jobs, there is captcha and reCaptcha as well. But all these just adds more weight to the page, and rather unnecessary in most of the situations. Please follow the code samples below, you'll see what I mean. And yes, you don't need ajax submit library to submit a form. Sample of email validation attached.