I have an email form, and I was wondering if I can have something required in the form, for it to send. For instance, if I was typing my email address, but it was a fake one, so I didn't put the @ sign in it, the form would detect that, and send me to another page, and it doesn't send the email.
Is this possible with HTML?

you would have to use a serverside language such as PHP to detect and redirect. do you currently use your own PHP script for form processing?

Okay. No, I don't use my own PHP script, but I can.