Custom JQuery Contact Form 7 Validation

Hi,

I’m trying to add a jquery validation on my contact form.
It should just check that the email is not a gmail.com or similar address, but that is instead a business email, i.e. custom domain.

I added the script to my custom javascript however contact form 7 doesn’t recognise it somehow.

Any ideas on how I can achieve this result?

Thanks!

P.S. The script is available here: https://pastebin.com/Hi7G8Bi3

P.P.S I’ve also tried with this, but nothing: https://stackoverflow.com/questions/26377034/custom-validation-to-check-business-email-and-phone-number-in-contact-form-7-in/33853110