The contact page is a messaging center for blog visitors who wants to write some lines to the admin for congratulations, advices, feedbacks and so on.
Basically it's similar to comments form, but more general.
This page has a form like this:
In order to protect this page (and comments, too) from spam messages is advisable to use a strong spam protection.
You might want to remove the contact page in order to prevent spam messages. This is the way to do so (suggested by laborix on the Support Forum):