Hey,
This is great plugin.
Would it be possible for future releases to use wp_mail() to send the emails instead of the php function mail()? The only reason I ask is, wp_mail() lets you hook into the mail being sent - php's built-in mail() does not. As a result, email-logging plugins and the like cannot detect the contact form's emails.
Cheers!
http://wordpress.org/extend/plugins/easy-speak-widget-contact-form/