Bp Contact Us package let you display a "contact us" form through a menu link to a site page or using a module, which you can display wherever you want.
Prevent email spam enabling captcha (requires Joomla recaptcha plugin enabled) and, if it not enough, limit 1 sending in a custom time lag. Not enough? Ban the IP and or the email with a click and the component will prevent other email sending.
Both the site page and the module forms work in jQuery, fast and clean.