fkuan.5smail.io.vn is a disposable email domain

fkuan.5smail.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": "fkuan.5smail.io.vn",
    "base_domain": "5smail.io.vn",
    "text": "Disposable email provider",
    "reason": "Heuristics: BP3",
    "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": false,
    "is_role_based_email": false,
    "mx_host": "route1.mx.cloudflare.net",
    "mx_ip": "162.159.205.12",
    "mx_info": "Using MX pointer route1.mx.cloudflare.net from DNS with priority: 1",
    "mx_fallback": false,
    "mx_hosts": [
        "route1.mx.cloudflare.net",
        "route3.mx.cloudflare.net",
        "route2.mx.cloudflare.net"
    ],
    "mx_ips": [
        "162.159.205.11",
        "162.159.205.12",
        "162.159.205.13",
        "2606:4700:f5::d",
        "2606:4700:f5::b",
        "2606:4700:f5::c",
        "162.159.205.25",
        "162.159.205.24",
        "162.159.205.23",
        "2606:4700:f5::13",
        "2606:4700:f5::11",
        "2606:4700:f5::12",
        "162.159.205.19",
        "162.159.205.18",
        "162.159.205.17",
        "2606:4700:f5::f",
        "2606:4700:f5::10",
        "2606:4700:f5::e"
    ],
    "mx_priorities": {
        "route1.mx.cloudflare.net": 1,
        "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": "2026-07-10T14:25:40+00:00"
}