Validators/Email.php

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<?php

 
namespace Depage\HtmlForm\Validators;

class Email extends Validator
{
    public function validate($email, $parameters = []): bool
    {
        $valid = (bool) filter_var($email, FILTER_VALIDATE_EMAIL);
 
        if ($valid && $parameters['checkDns']) {
            list($user, $domain) = explode('@', $email);
 
            $domain = idn_to_ascii($domain, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
 
            $valid = checkdnsrr(idn_to_ascii($domain . "."), 'MX');
        }
 
        return $valid;
    }
}