Well these guys class can check if the domain from which the email address is online.
It can provide some advanced email validation if he decides to take the visitor email, anyway never mind.
To be honest, I was thinking your comment was spam. Perhaps my sensors are set too high.
Based on the code posted, the email address which comes from the user ($_POST['Email']) is only used in the message body. The problem is caused by the hard-coded value used for $EmailFrom. The headers argument for "From:" requires an email address. Since one wasn't provided, it uses an address defined by the server.Go to the full post