Is htto.com valid?
How to block htto.com e-mail domain
htto.com
htto.com 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 htto.com 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": "htto.com",
"text": "Should be blocked",
"reason": "Heuristics: BM1",
"risk": 45,
"mx_host": "htto.com",
"possible_typo": [],
"mx_ip": "91.107.214.206",
"mx_info": "No MX-pointer in DNS record. Using domain: htto.com",
"last_changed_at": "2025-08-06T17:47:33+02:00"
}
htto.com
Status: Should be blocked
RISK
MEDIUM
Domain risk: 45
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