Disposable
Email Checker.
Paste any email address or domain. Know in milliseconds whether it's a throwaway inbox, a relay address, or the real thing — validated against the same engine that powers SignupGuard in production.
Why it
matters.
Disposable email addresses exist for one reason: to give someone a working inbox they can walk away from. That convenience becomes a problem the moment trust, billing, or reputation depends on who is behind the address.
Fake signups at scale
Throwaway inboxes let a single actor create hundreds of accounts in minutes — skewing funnels, draining free tiers, and triggering abuse reviews that shouldn't exist.
Trial abuse & refund fraud
New email, new free trial, new identity. The same user can recycle through credits indefinitely unless the signal is caught at the registration edge.
Deliverability collapse
Temporary addresses bounce, mark you as spam, and poison your sender reputation with ESPs. A clean list starts with a clean intake.
Polluted analytics
Throwaway cohorts distort retention, conversion, and CAC numbers. The cost isn't just abuse — it's the decisions you make on bad data.
Under the
hood.
Every lookup runs through the same pipeline SignupGuard uses in production — no mock data, no stale lists.
300,000+ disposable domains, always fresh
Our database indexes the long tail of throwaway providers and is refreshed every minute as new services come online. You get the same coverage our API customers pay for.
MX verification, not just name matching
We resolve live mail-exchange records for the domain you submit. A domain with no reachable MX can't receive email — a blocklist match is not a guess, it's a proof.
Sub-100ms on every check
Edge-cached lookups mean the verdict lands before the network round-trip completes. This is the same budget we hold ourselves to inside our customers' signup forms.
Drop-in API when you're ready
Liked the result? The same endpoint lives behind one HTTP call and a single API key. No SDK, no webhook, no infrastructure.
Protect Your Platform
SignupGuard's API detects disposable emails in real-time with 99.99% accuracy.
Real-time detection
Block at signup
300K+ domains
Updated daily
100ms response
Lightning fast