[Plugin: Contact Form 7] plugin interaction with contact form 7

Dear staff,

I am writing a wordpress plugin for prevention spam, this plugin work for submit comment and sign up form of wordpress, I would like to interact with your plugin. what is the best solution for add a check in contact form plugin and prevent spammer? My plugin must check only remote ip address

thank you
Alessio

https://www.ads-software.com/extend/plugins/contact-form-7/