RFCValidation example

  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()));
  }

}

$this->assertFalse($validator->isValid('example@example.com@'));
    $this->assertFalse($validator->isValid('example@example .com'));
  }

  /** * @covers ::isValid */
  public function testIsValidException() {
    $validator = new EmailValidator();
    $this->expectException(\BadMethodCallException::class);
    $this->expectExceptionMessage('Calling \Drupal\Component\Utility\EmailValidator::isValid() with the second argument is not supported. See https://www.drupal.org/node/2997196');
    $validator->isValid('example@example.com', (new RFCValidation()));
  }

}

public function __construct(string $address, string $name = '')
    {
        if (!class_exists(EmailValidator::class)) {
            throw new LogicException(sprintf('The "%s" class cannot be used as it needs "%s". Try running "composer require egulias/email-validator".', __CLASS__, EmailValidator::class));
        }

        self::$validator ??= new EmailValidator();

        $this->address = trim($address);
        $this->name = trim(str_replace(["\n", "\r"], '', $name));

        if (!self::$validator->isValid($this->address, class_exists(MessageIDValidation::class) ? new MessageIDValidation() : new RFCValidation())) {
            throw new RfcComplianceException(sprintf('Email "%s" does not comply with addr-spec of RFC 2822.', $address));
        }
    }

    public function getAddress(): string
    {
        return $this->address;
    }

    public function getName(): string
    {