Is protonmail.cz valid?

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

Raw API JSON response:

{
    "valid": true,
    "block": true,
    "domain": "protonmail.cz",
    "base_domain": "protonmail.cz",
    "text": "Domain is parked",
    "reason": "parked",
    "risk": 75,
    "is_disposable": false,
    "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": true,
    "is_role_based_email": false,
    "mx_host": "protonmail.cz",
    "mx_ip": "37.9.175.164",
    "mx_info": "No MX-pointer in DNS record. Using domain: protonmail.cz",
    "mx_fallback": true,
    "mx_hosts": [],
    "mx_ips": [],
    "mx_priorities": [],
    "email_provider": null,
    "disposable_provider": null,
    "possible_typo": [
        "protonmail.com"
    ],
    "domain_age_days": 3211,
    "domain_created_at": "2018-01-07T00:00:00+00:00",
    "block_status_changed_at": "2026-09-17T13:19:36+00:00"
}