How to block Disposable Email Addresses in your website's registration form?

Question

I would like to know of the possible ways to block disposable email addresses from registering in my website.

For simplicity, let\'s take the example where the regi

Answer 1

You can make two checks: spamhaus sbl query and your own list of blacklisted domains. Something like this:

private static function __emailDomainCheck($email)
{
    $domain = preg_replace('/^.*@(.*)/', '$1', $email);

    $blacklisted = Database::q('SELECT * FROM ' . Database::T('email_domain_blacklist') . ' WHERE domain = ?', array($domain));
    if($blacklisted->rowCount() > 0)
        return "This email domain is blacklisted!";

    $host = gethostbyname($domain);

    $rbl  = 'sbl-xbl.spamhaus.org';
    $rev = array_reverse(explode('.', $host));

    $lookup = implode('.', $rev) . '.' . $rbl;

    if ($lookup != gethostbyname($lookup))
    {
        return "Mail host is listed in $rbl!";
    }
    return '';
}