z4zq.reg.io.vn is a disposable email domain

z4zq.reg.io.vn is a disposable temp email domain from 5smail.email that provides throwaway email addresses and should be blocked. These temporary addresses are frequently exploited to bypass verification systems and create fake accounts.

Raw API JSON response:

{
    "valid": true,
    "block": true,
    "domain": "z4zq.reg.io.vn",
    "base_domain": "reg.io.vn",
    "text": "Highly suspicious",
    "reason": "Anomalies detected",
    "risk": 100,
    "is_disposable": true,
    "is_email_forwarder": true,
    "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": null,
    "is_role_based_email": false,
    "mx_host": "route3.mx.cloudflare.net",
    "mx_ip": "162.159.205.24",
    "mx_info": "Using MX pointer route3.mx.cloudflare.net from DNS with priority: 24",
    "mx_fallback": false,
    "mx_hosts": [
        "route3.mx.cloudflare.net",
        "route2.mx.cloudflare.net",
        "route1.mx.cloudflare.net"
    ],
    "mx_ips": [
        "162.159.205.24",
        "162.159.205.25",
        "162.159.205.23",
        "162.159.205.17",
        "162.159.205.18",
        "162.159.205.19",
        "162.159.205.11",
        "162.159.205.13",
        "162.159.205.12"
    ],
    "mx_priorities": {
        "route1.mx.cloudflare.net": 98,
        "route2.mx.cloudflare.net": 86,
        "route3.mx.cloudflare.net": 24
    },
    "email_provider": "Cloudflare Email Routing",
    "disposable_provider": "5smail.email",
    "possible_typo": [],
    "domain_age_days": null,
    "domain_created_at": null,
    "block_status_changed_at": "2026-09-13T09:34:03+00:00"
}