Is sar.usf.edu valid?

sar.usf.edu 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": "sar.usf.edu",
    "base_domain": "usf.edu",
    "text": "Domain cannot receive email",
    "reason": "Domain declares it accepts no mail",
    "risk": 10,
    "is_disposable": false,
    "is_email_forwarder": false,
    "is_public_free": false,
    "is_public_premium": false,
    "is_business_provider": true,
    "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": "sar-usf-edu.mail.protection.outlook.com",
    "mx_ip": "52.101.41.56",
    "mx_info": "Domain declares it accepts no mail (RFC 7505 null MX).",
    "mx_fallback": false,
    "mx_hosts": [
        "sar-usf-edu.mail.protection.outlook.com"
    ],
    "mx_ips": [
        "52.101.41.56",
        "52.101.194.13",
        "52.101.50.1",
        "40.93.192.4"
    ],
    "mx_priorities": {
        "sar-usf-edu.mail.protection.outlook.com": 10
    },
    "email_provider": "Exchange Online",
    "disposable_provider": null,
    "possible_typo": [],
    "domain_age_days": null,
    "domain_created_at": null,
    "block_status_changed_at": "2026-08-11T04:29:53+00:00"
}