EmailValidator.php

<?php

namespace Drupal\Component\Utility;

use Egulias\EmailValidator\EmailValidator as EmailValidatorUtility;
use Egulias\EmailValidator\Validation\EmailValidation;
use Egulias\EmailValidator\Validation\RFCValidation;

/**
 * Validates email addresses.
 */
class EmailValidator extends EmailValidatorUtility implements EmailValidatorInterface {
    
    /**
     * Validates an email address.
     *
     * @param string $email
     *   A string containing an email address.
     * @param \Egulias\EmailValidator\Validation\EmailValidation|null $email_validation
     *   This argument is ignored. If it is supplied an error will be triggered.
     *   See https://www.drupal.org/node/2997196.
     *
     * @return bool
     *   TRUE if the address is valid.
     */
    public function isValid($email, EmailValidation $email_validation = NULL) {
        if ($email_validation) {
            throw new \BadMethodCallException('Calling \\Drupal\\Component\\Utility\\EmailValidator::isValid() with the second argument is not supported. See https://www.drupal.org/node/2997196');
        }
        return parent::isValid($email, new RFCValidation());
    }

}