Email sending doesn't work through Webform
It appears you're running your site on Windows. Either IIS or Apache? 

Sending mail on windows based servers is a bit different. It cannot used php's normal method for sending mail if it were on a linux server. 

You must configure an SMTP server in either your PHP.ini, or leverage the SMTP Auth module and connect to an SMTP server.

PHP.ini setup:


http://www.quackit.com/php/tutorial/php_mail_configuration.cfm
https://stackoverflow.com/questions/112190/php-ini-smtp-how-do-you-pass-username-password