Free · No signup required
Free email verification tool
Check any email address for deliverability, disposable domains and risk, with real results from the RiskUnified API. No signup needed.
What is in an email validation check from RiskUnified?
Real-time SMTP verification
The gold standard for deliverability, confirming the mailbox accepts mail, returned in under a second.
Real-time MX checks
Verifies the domain's mail servers so you know mail can actually be routed to it.
Disposable email detection
Catches temporary and burner providers, including brand-new domains no blocklist has seen yet.
Low-reputation domain alerts
Flags domains with poor sending reputation and abuse history.
Toxic domain detection
Avoid domains associated with spam and abuse that hurt deliverability.
Catch-all detection
Identifies domains that accept mail for any address, a common cover for fake identities.
Free email provider detection
Screen users on free consumer providers with an extensive, maintained list.
Role-address detection
Flags role emails such as sales@ and info@ that rarely belong to a single person.
Domain age
Understand the age of any domain from an email address, young domains carry more risk.
Gibberish prefix detection
Catches randomly generated local parts that signal automated or throwaway signups.
Alias & plus/dot tricks
Detects Gmail plus tags and dot variants used to spin up many accounts from one inbox.
Spam-trap signals
Protect your sender reputation by avoiding addresses that look like spam traps.
Greylist awareness
Accounts for greylisting so temporary deferrals aren't mistaken for hard failures.
Address history
How often an address has been seen before, established addresses are lower risk.
Quality risk score
Every check returns a single low / medium / high verdict with the named signals behind it.
Frequently asked questions
Is this email checker really free?
Yes. You can verify emails here with no signup and no credit card. For your own API key, every account includes 100 free checks a month.
Does it send an email to the address?
No. Verification checks the mailbox at the mail-server level via SMTP without delivering a message, so the person never receives anything.
What does 'catch-all' mean?
A catch-all domain accepts mail for any address, so a specific mailbox can't be confirmed. It's common on custom domains but raises risk when paired with a young domain.
How do I use this in my own product?
Generate a free API key and POST an email to the /email_risk endpoint. You get the same structured result you see here, in a few lines of code.
Build this into your product
Get your own API key with 100 free checks a month. No credit card required.