EXCELIA_DBARR/includes/swiftmailer/egulias/email-validator/EmailValidator/Exception/DomainAcceptsNoMail.php

<?php

namespace Egulias\EmailValidator\Exception;

class DomainAcceptsNoMail extends InvalidEmail
{
    const CODE = 154;
    const REASON = 'Domain accepts no mail (Null MX, RFC7505)';
}