Most of the time when I see issues with receiving the email it is due to email server settings. Is your SMTP server local to your web server? If so you can try leaving this value blank in the globals file:
$WAGLOBAL_Email_Server = "" ;
As far as changing the names you will not need to do anything for the name of the folder, you can call this what you want. If you update the file names you should make sure to do a find and replace in all of the contact form pages to ensure that the name of the page gets updated anywhere it is referenced.
