Is guerrillamail.biz a Disposable Email? 2026 Risk & Blocklist Report

What is guerrillamail.biz?

GuerrillaMail generates anonymous disposable aliases and rotates across multiple stealth domains so that blocking a single domain does not stop the service.

Why guerrillamail.biz matters for fraud

Anonymous forum spam and SaaS freemium API-key farming, with domain rotation to evade naive blocklists.

How to block guerrillamail.biz in your app

const res = await fetch('https://verishield-edge.p.rapidapi.com/v1/verify?email=user@guerrillamail.biz', {
  headers: { 'X-RapidAPI-Key': process.env.RAPIDAPI_KEY }
});
const report = await res.json();
if (report.fraud_risk.recommendation === 'BLOCK') {
  // reject signup from @guerrillamail.biz
}

import httpx
report = httpx.get('https://verishield-edge.p.rapidapi.com/v1/verify', params={'email': 'user@guerrillamail.biz'},
                 headers={'X-RapidAPI-Key': KEY}).json()
if report['fraud_risk']['recommendation'] == 'BLOCK':
    raise ValueError('Blocked domain: guerrillamail.biz')

How VeriShield Edge detects it

• ✓Disposable blocklist match across thousands of throwaway domains
• ✓MX, SPF and DMARC posture inspection via DNS-over-HTTPS
• ✓Live RDAP domain-age and registrar intelligence
• ✓Shannon entropy analysis of the username for bot detection
• ✓Datacenter / VPN ASN reputation on the signup IP
• ✓Canonical Gmail normalization to collapse alias variants

Frequently asked questions