Is kaffeine.jp valid?
How to block kaffeine.jp e-mail domain
kaffeine.jp
kaffeine.jp 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 for some reason.
The best way to detect and block domains like kaffeine.jp is to use the Check-Mail API, available for free, for all programming languages.
Raw API JSON response:
"valid": true,
"block": true,
"disposable": false,
"email_forwarder": false,
"domain": "kaffeine.jp",
"text": "Looks suspicious",
"reason": "Heuristics: T2",
"risk": 99,
"mx_host": "mxa.mailgun.org",
"possible_typo": [],
"mx_ip": "34.160.157.95",
"mx_info": "Using MX pointer mxa.mailgun.org from DNS with priority: 10",
"last_changed_at": "2025-08-28T13:55:08+02:00"
}
kaffeine.jp
Status: Looks suspicious
RISK
HIGH
Domain risk: 99
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