Add a CATPCHA or a method to stop spam to the "Contact Site Administrator Form"

Problem Definition

When the Contact Site Administrators form is enabled, users could create SPAM or abuse the system as there is no CAPTCHA for that form.

Suggested Solution

Add a CAPTCHA to the Contact Site Adminsitrator form to avoid SPAM
 

Workaround

There is no workaround apart from not having the form enabled.