Validator.php

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<?php
namespace Magento\Quote\Model\Quote\Address;

use Zend_Validate_Exception;

class Validator extends \Magento\Framework\Validator\AbstractValidator
{
    protected $countryFactory;

    public function __construct(
        \Magento\Directory\Model\CountryFactory $countryFactory
    ) {
        $this->countryFactory = $countryFactory;
    }

    public function isValid($value)
    {
        $messages = [];
        $email = $value->getEmail();
        if (!empty($email) && !\Zend_Validate::is($email, \Magento\Framework\Validator\EmailAddress::class)) {
            $messages['invalid_email_format'] = 'Invalid email format';
        }

        $countryId = $value->getCountryId();
        if (!empty($countryId)) {
            $country = $this->countryFactory->create();
            $country->load($countryId);
            if (!$country->getId()) {
                $messages['invalid_country_code'] = 'Invalid country code';
            }
        }

        $this->_addMessages($messages);

        return empty($messages);
    }
}