Detect disposable emails before they wreck your signups
Stop fake signups, prevent trial abuse, and maintain high-quality user data with a detection engine that updates itself in real time — not a stale blocklist.
Trusted in the signup flow of
The Static List Fallacy
Stale blocklists miss new temp-mail domains. Static lists are outdated the moment they're published — bad actors spin up new domains faster than human curators can track them.
Tempo Checker solves this with active monitoring.
DOMAIN: temp-mail-xyz-99.net
STATUS: Known disposable
ACTION: Blocked
Our Verification Engine
Domain List Match
High-speed lookup against known disposable providers. Our foundational cache processes millions of established bad domains in milliseconds.
DNS/MX Validation
Real-time verification of mail server records and domain health. We verify that the domain can actually receive mail right now.
AI Scraper Agent
Our proprietary agent constantly crawls the web to identify new temporary email services before they hit common lists.
What that actually gets you
Stop paying for fake trials
Every disposable signup that slips through is a free-tier seat or trial you're funding for nobody. Cut it off at the form.
Protect your sender reputation
Bounces from dead temp-mail inboxes drag down deliverability for every real customer on your list. Keep your domain clean.
Trust your growth metrics
Activation and conversion rates mean something again once bot and burner accounts stop diluting the numerator.
Ship it in an afternoon
One POST request at signup. No infra to run, no list to maintain — we push new domains to the API continuously.
Test our tool
Instant manual checks. Paste an email address and get an immediate verdict. Perfect for quick investigations and low-volume manual review.
REST API
Server-to-server real-time validation. Seamlessly integrate with your signup flow to block bad actors at the source.
curl -X POST https://api.tempochecker.com/v1/verify \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "[email protected]"}'Teams who cleaned up their signups
"We cut fake trial signups by 34% in the first week. It paid for itself before the first invoice."
"Integration took less time than writing the ticket to ask for it. Genuinely a 20-minute job."
"Our bounce rate on welcome emails dropped almost immediately. Deliverability team was thrilled."
Questions, answered
How is this different from a blocklist I could get for free?
Free lists are a snapshot from whenever they were last published. Our scraper agent and DNS/MX layer catch domains that spun up in the last few hours, not the last few months.
Will this ever block a real customer?
Every verdict comes with a confidence score and reason, so you decide whether to hard-block, soft-warn, or just flag for review — you're never locked into an all-or-nothing rule.
How fast is the API in production?
Median response time is under 50ms, so it sits comfortably in a signup form's validation step without adding perceptible lag.
Do you store the emails I send you?
No — we check the domain in real time and don't retain the full address. Full details are in the Privacy page linked below.
Start blocking disposable signups today
500 free checks a month, no card required. Upgrade whenever your signup volume outgrows it.