Validating Contact form by not accepting Gmail Emails

Paste this one into your functions.php
Please note that I have changed my email field name from [your-email] to [company-email]

// Add custom validation for CF7 form fields
function is_company_email($email){ // Check against list of common public email providers & return true if the email provided *doesn't* match one of them
	if(
		preg_match('/@gmail.com/i', $email) ||
		preg_match('/@hotmail.com/i', $email) ||
		preg_match('/@live.com/i', $email) ||
		preg_match('/@msn.com/i', $email) ||
		preg_match('/@aol.com/i', $email) ||
		preg_match('/@yahoo.com/i', $email) ||
		preg_match('/@inbox.com/i', $email) ||
		preg_match('/@gmx.com/i', $email) ||
		preg_match('/@me.com/i', $email) ||
		preg_match('/@icloud.com/i', $email)
	){
		return false; // It's a publicly available email address
	}else{
		return true; // It's probably a company email address
	}
}

function custom_email_validation_filter($result, $tag) {  

 $tag = new WPCF7_Shortcode( $tag );

   if ( 'company-email' == $tag->name ) {

 $the_value = isset( $_POST['company-email'] ) ? trim( $_POST['company-email'] ) : '';

           if(!is_company_email($the_value)){
                     $result->invalidate( $tag, "Please Enter your Company E-Mail Address" );
           }
      }
       return $result;
 }

add_filter( 'wpcf7_validate_email', 'custom_email_validation_filter', 10, 2 );
add_filter( 'wpcf7_validate_email*', 'custom_email_validation_filter', 10, 2 );