Is postmaster.emailsrvr.com valid?

postmaster.emailsrvr.com is a valid domain that should be allowed to do sign-ups and registrations. Based on our analysis, you should allow this domain.

Raw API JSON response:

{
    "valid": true,
    "block": false,
    "domain": "postmaster.emailsrvr.com",
    "base_domain": "emailsrvr.com",
    "text": "Looks somewhat suspicious",
    "reason": "Some anomalies detected",
    "risk": 40,
    "is_disposable": false,
    "is_email_forwarder": false,
    "is_public_free": false,
    "is_public_premium": false,
    "is_business_provider": true,
    "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": "postmaster.emailsrvr.com",
    "mx_ip": "104.239.227.30",
    "mx_info": "No MX-pointer in DNS record. Using domain: postmaster.emailsrvr.com",
    "mx_fallback": true,
    "mx_hosts": [],
    "mx_ips": [],
    "mx_priorities": [],
    "email_provider": "Rackspace Email",
    "disposable_provider": null,
    "possible_typo": [],
    "domain_age_days": null,
    "domain_created_at": null,
    "block_status_changed_at": "2025-11-23T17:23:43+00:00"
}