Ok, for your PHP code, you have it titled as check3.php, but for your HTML code it's send3.php.

Are both the HTML and PHP code within one page? It really doesn't matter just wondering.

Because if you want the HTML to go to the PHP code, that's fine. I'm just confused because it's submitting to send3.php but in the PHP code, you call it check3.php.....


Also, which undefined variables is it complaining about?