[Plugin: Contact Form 7] Deny mails from @mydomain.com

hi,how can i deny users from send email from @mydomain.com

i want error message appear,like: you can not send email from this kind of domain or something

i found something on simplemachines forum,not sure,can i use this somehow on contact form7?

thank you

here is code i found and describes what i want to do…

if (preg_match(‘~@(hotmail\.com|aol\.com|yahoo\.com|gmail\.com|engineer\.com|mail\.com|otherwebmailsite\.org)$~’, $_POST[’email’]))
fatal_error(‘Sorry, but you cannot register here with a webmail/free email account. Please choose a different email address, and remember that you can choose to keep your email hidden.’, false);

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