Is fastser.com valid?

fastser.com

fastser.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 fastser.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": "fastser.com",
    "text": "Highly suspicious",
    "reason": "Anomalies detected",
    "risk": 100,
    "mx_host": "mx.fastser.com",
    "possible_typo": [],
    "mx_ip": "62.149.128.166",
    "mx_info": "Using MX pointer mx.fastser.com from DNS with priority: 10",
    "last_changed_at": "2026-01-30T21:09:36+00:00"
}