Not sure if this happened after upgrading to WordPress 3.5 or updating the salesforce plugin to 2.0.3, but we receive 3 emails for every form submission on our website: http://www.campgroundautomation.com/about-cas/contact/. It also creates 3 duplicate leads in Salesforce.
I looked at another thread on this forum about duplicate emails but I verified that only one <form> tag was in the source for that page.
Let me know some things to try. The 'send a copy' also sends multiple ones as well.