Email address validator — syntax and disposable check
Check whether an email address has valid syntax and whether it uses a known disposable domain. It runs entirely in your browser (0 uploads, works offline).
How to use it
- Enter the email address (or one per line).
- Read whether the syntax is valid and if the domain is disposable.
- Copy or Download the result.
FAQ
How do I validate an email address for free?
Enter the address and this page checks it against a practical email syntax and against a list of known disposable domains, on your device with no upload.
Does it check that the mailbox actually exists?
No — and it says so. Confirming a mailbox exists needs a live MX/DNS lookup, which is a network request; this tool stays network-zero and checks syntax and the disposable-domain list only.
Is the address uploaded anywhere?
No. The check runs entirely in your browser and nothing is transmitted or stored, which you can verify by turning off your Wi-Fi.
What counts as a disposable domain?
Throwaway providers like Mailinator and 10 Minute Mail that people use to avoid giving a real address. The tool flags the common ones so you can decide how to treat them.
Limits
Validates syntax and flags disposable domains; it does not verify deliverability, which would require a DNS/MX lookup.
Related
The email header analyzer traces a received message; the PII detector finds personal data.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.