spam on contactus page

Hello ,
I have a contact us form on the site where users can submit their enquiries. Since last few weeks I am getting loads of automatic or junk messages from this page.
Can someone please let me know if there is an easy way of stopping this? I have seen quite a few websites having users to verify some uniquely generated code before submitting the page, perhaps this could avoid spammers?
Please can someone advice/help me on this.
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