I'm starting to get fed up with this plugin. The custom forms option has hardly any features functional. No e-mail sent, no attachments received - when you view the submission in WordPress, and the required attachment/file check fails to work. After many hours of graft trying to get this (quite obviously) unsupported plugin working, I give up! Looks like I will have to shell out for Gravity forms. Seriously, if you need a forms solution for a professional website - this isn't it!