ultrafive.online is a disposable email domain

ultrafive.online is a disposable temp email domain from mail.chatgpt.org.uk 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": "ultrafive.online",
    "base_domain": "ultrafive.online",
    "text": "Disposable \/ temporary domain",
    "reason": "Heuristics: DM1",
    "risk": 92,
    "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": null,
    "is_role_based_email": false,
    "mx_host": "email.chatgpt.org.uk",
    "mx_ip": "138.226.240.26",
    "mx_info": "Using MX pointer email.chatgpt.org.uk from DNS with priority: 0",
    "mx_fallback": false,
    "mx_hosts": [
        "email.chatgpt.org.uk"
    ],
    "mx_ips": [
        "138.226.240.26"
    ],
    "mx_priorities": {
        "email.chatgpt.org.uk": 0
    },
    "email_provider": null,
    "disposable_provider": "mail.chatgpt.org.uk",
    "possible_typo": [],
    "domain_age_days": 1,
    "domain_created_at": "2026-08-18T00:00:00+00:00",
    "block_status_changed_at": "2026-08-19T12:01:04+00:00"
}