Developer tool
Disposable Email Checker
Look up whether an email domain is on a 10,143-domain disposable-provider blocklist, with role-account detection.
Check an address
Blocklist lookup
Email address or domain. A trailing dot is ignored; IDN addresses need the punycode form.
Checks run against a snapshot of 10,143 known disposable domains. A provider registered after the snapshot may not be listed yet.
Result
- Address
- Domain
- Blocklist match
- Role account
- Blocklist
What this result does and does not mean
- A blocklist only knows providers known today; a domain registered yesterday will not be on it.
- Not being listed is not proof that the mailbox exists or accepts mail.
- Use the result as a quick screen, then verify important signups another way.
How it works
Enter a full email address or just a domain.
The checker looks it up in a bundled snapshot of known disposable domains and flags role accounts separately.
Read the result: disposable, free, unknown or role address, with the matching domain information.
Treat the result as a signal, not proof that a mailbox exists or will accept mail.
Frequently asked questions
What does a disposable result mean?
It means the domain appears on the bundled list of known throwaway or temporary email providers. It does not prove that a particular mailbox exists, that the address belongs to the person using it, or that the provider will accept or retain mail.
How current is the domain list?
The list is a snapshot of 10,143 known disposable domains captured on 2026-11-06. New providers appear regularly, so a domain that is missing from the list may still be disposable.
What if the domain is not listed?
Not being listed is not proof that an address is genuine. It may be a new provider, a private domain, a forwarding service or a free mailbox. For anything important, confirm the address through your own signup or verification flow rather than relying on the lookup alone.
What is a role account?
Role addresses such as info@, support@, sales@ and admin@ belong to a function rather than a person. They are flagged separately because they are often shared or automated, not because they are disposable.
Can I check a list of addresses or a CSV?
No. The checker handles one address or domain at a time and does not provide CSV import or bulk lookup. That keeps the page simple and avoids sending a list of addresses through a bulk workflow.
Is the address I enter sent to a server?
No. The domain list is bundled with the page and the lookup happens in your browser. Ontool does not receive the address you type, and there is no account or lookup history.