Is by.com valid?

by.com 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.

Raw API JSON response:

{
    "valid": false,
    "block": true,
    "domain": "by.com",
    "base_domain": "by.com",
    "text": "Invalid domain.",
    "reason": "Domain no longer accepts mail",
    "risk": 45,
    "is_disposable": false,
    "is_email_forwarder": false,
    "is_public_free": false,
    "is_public_premium": false,
    "is_business_provider": false,
    "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": "by.com",
    "mx_ip": "34.102.136.180",
    "mx_info": "No MX-pointer in DNS record. Using domain: by.com",
    "mx_fallback": true,
    "mx_hosts": [
        "by.com"
    ],
    "mx_ips": [
        "34.102.136.180"
    ],
    "mx_priorities": [],
    "email_provider": null,
    "disposable_provider": null,
    "possible_typo": [],
    "domain_age_days": 11339,
    "domain_created_at": "1995-09-19T00:00:00+00:00",
    "block_status_changed_at": "2026-09-11T11:10:08+00:00"
}