lkj.com is a disposable email domain

lkj.com is an invalid domain that should be blocked from sign-ups or registrations. Based on our analysis, you should block this invalid domain. If a user is trying to sign-up using an e-mail on this domain, it's likely a typo, or a malicious attempt.

Raw API JSON response:

{
    "valid": false,
    "block": true,
    "domain": "lkj.com",
    "base_domain": "lkj.com",
    "text": "Disposable \/ temporary domain",
    "reason": "Heuristics x1",
    "risk": 91,
    "is_disposable": true,
    "is_email_forwarder": false,
    "is_public_free": false,
    "is_public_premium": false,
    "is_business_provider": false,
    "is_isp_email": false,
    "is_email_api": false,
    "is_web_hosting_email": false,
    "is_self_hosted": false,
    "is_parked": false,
    "is_role_based_email": false,
    "mx_host": null,
    "mx_ip": "127.0.0.1",
    "mx_info": "Using MX pointer localhost from DNS with priority: 0",
    "mx_fallback": false,
    "mx_hosts": [
        "localhost"
    ],
    "mx_ips": [
        "127.0.0.1"
    ],
    "mx_priorities": {
        "localhost": 0
    },
    "email_provider": null,
    "disposable_provider": null,
    "possible_typo": [],
    "domain_age_days": 9648,
    "domain_created_at": "1999-12-08T00:00:00+00:00",
    "block_status_changed_at": "2020-05-29T03:29:31+00:00"
}