Sending Forms and Emails in WP Environment..This is tricky

Hopefully this is viewed as a WP issue and not a coding problem.

My form verification code works just fine in the WP environment.

My verification code is stored on the same page as the form…here:

<form action='<?php echo bloginfo('url'); ?>/make-appointments'

So when the form is submitted is does the error check and notifies of errors.

The Problem I’m having is when the form doesn’t have errors and it’s submitted. Instead of the page executing the code I have under a “successful condition” (i.e…send an email), it redirects to a random page that isn’t even found (404 error).

When doing things like sending emails or form verfication, does this need to be done outside of the WP environment?