undertonex.xyz is a disposable email domain

undertonex.xyz is a disposable temp email domain from catchmail.io 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": "undertonex.xyz",
    "base_domain": "undertonex.xyz",
    "text": "Disposable email provider",
    "reason": "Heuristics: BP3",
    "risk": 90,
    "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": "smtp.catchmail.io",
    "mx_ip": "157.173.105.118",
    "mx_info": "Using MX pointer smtp.catchmail.io from DNS with priority: 10",
    "mx_fallback": false,
    "mx_hosts": [
        "smtp.catchmail.io"
    ],
    "mx_ips": [
        "157.173.105.118"
    ],
    "mx_priorities": {
        "smtp.catchmail.io": 10
    },
    "email_provider": null,
    "disposable_provider": "catchmail.io",
    "possible_typo": [],
    "domain_age_days": null,
    "domain_created_at": null,
    "block_status_changed_at": "2026-08-20T08:11:35+00:00"
}