Is yahoo.comnnb valid?
How to block yahoo.comnnb invalid e-mail domain
yahoo.comnnb
yahoo.comnnb is an invalid domain that should be blocked from sign-ups or registrations. Based on our analysis, you should block this invalid domain. If a user is trying to sign-up using an e-mail on this domain, it's likely a typo, or a malicious attempt.
The best way to detect and block invalid email domains like yahoo.comnnb is to use the Check-Mail API, available for free, for all programming languages.
Raw API JSON response:
"valid": false,
"block": true,
"disposable": false,
"email_forwarder": false,
"domain": "yahoo.comnnb",
"text": "Invalid domain.",
"reason": "Unable to get domain or MX pointer.",
"risk": 45,
"mx_host": "yahoo.comnnb",
"possible_typo": [],
"mx_ip": null,
"mx_info": "No MX-pointer in DNS record. Using domain: yahoo.comnnb",
"last_changed_at": "2025-09-18T15:33:24+02:00"
}
yahoo.comnnb
Status: Invalid domain.
RISK
MEDIUM
Domain risk: 45
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