How to remove spam enteries from Web-to-case forms?

Hello,

We are using a web-to-case form on our experience site. There are three fields on the form 1. Email 2. Subject 3. Description. Out of these only email is a required field. We get a lot of spams and sometimes actual tickets gets lost in them. Is there a way to prevent spams here? Will adding more required fields prevent spam entries? Is there a way to match them to current contact record to see if the person already exists?

Any Help here would be higly appreciated.

 Thanks in advance! 

#Experience Cloud  #Experience Site  #Digital Experience Platforms  #Service Cloud