https://contactform7.com/spam-filtering-with-akismet/
Quick GUIDE
Install Askimet and ensure it is working with API key
Then ensure the following fields are updated accordingly.
akismet:author
You give this option to the field where submitters input their names.
Example: [text* your-name akismet:author]
akismet:author_email
You give this option to the field where submitters input their email addresses.
Example: [email* your-email akismet:author_email]
akismet:author_url
You give this option to the field where submitters input the URL of their websites.
Example: