Catch disposable emails before they pollute your funnel
VerifyWall maintains an updated database of 50,000+ disposable email domains, blocking throwaway addresses at signup.
What it is
Disposable emails are temporary, self-destructing email addresses from services like Guerrilla Mail, Mailinator, and Temp Mail. Users create them in seconds to bypass email verification, abuse free trials, and create multiple fake accounts without revealing their real identity.
Why it matters for SaaS
For SaaS businesses, disposable emails are a direct attack on your growth metrics. They inflate signups with users who will never convert, abuse free trials repeatedly, and make it impossible to reach customers for onboarding or retention. A single bad actor can create dozens of accounts, draining resources from customer support, compute costs, and marketing attribution.
How VerifyWall detects it
VerifyWall checks every email against a continuously updated database of known disposable email providers. We go beyond simple domain matching — our system detects subdomain tricks, newly registered disposable services, and catch-all patterns that disposable providers use. When a disposable email is detected, the risk score increases significantly and the "disposable_email" reason is included in the API response.
Risk score impact
Disposable emails add 80 points to the risk score, pushing a check into high risk territory on their own.
API response example
When this threat type is detected, the API returns a response like this:
{
"data": {
"id": "a1b2c3...",
"type": "checks",
"attributes": {
"subject": "[email protected]",
"subject_type": "email",
"risk_score": 80,
"risk_level": "high",
"reasons": [
"disposable_email"
],
"details": {
"email": "[email protected]",
"domain": "guerrillamail.com",
"is_disposable": true,
"has_mx_records": true,
"is_free_provider": false
}
}
}
}Frequently asked questions
How many disposable email providers does VerifyWall detect?
VerifyWall maintains a database of over 50,000 disposable email domains and patterns, updated every six hours. This includes major services like Guerrilla Mail, Mailinator, and Temp Mail, as well as lesser-known and newly created providers.
Can users bypass detection by using subdomains?
No. VerifyWall detects subdomain-based disposable emails (e.g., [email protected]) as well as domain aliases and catch-all patterns commonly used by disposable email services.
What happens if a legitimate email domain is flagged as disposable?
You can add any domain to your whitelist to override the disposable email detection. This ensures that trusted domains are never blocked, even if they share patterns with disposable services. False positives are extremely rare due to our curated database approach.
Related resources
Integration Guides
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