Free disposable email checker
Paste a list and it is sorted into throwaway inboxes, shared role mailboxes, free providers and malformed addresses. Checks 85 known throwaway domains. Free, no sign-up, and nothing you paste leaves your browser.
Paste your list
One per line, or comma separated. Nothing leaves your browser.
Result
Paste a list on the left and it is sorted here as you type.
Not everything flagged should be deleted
Two of these four categories are usually worth keeping, which is why the tool separates them instead of stripping them out.
Throwaway inboxes
Temporary services like Mailinator, Guerrilla Mail and 10 Minute Mail.
Remove them. Nobody reads these, and a reply was never coming.
Malformed addresses
Anything that is not a usable address shape — paste errors, stray text, missing domains.
Remove them. They bounce immediately and every bounce costs reputation.
Role mailboxes
Shared boxes: info@, hello@, sales@, support@.
Keep for local businesses. For a one-person trade this is often the only address. Expect lower reply rates.
Free providers
Gmail, Outlook, Yahoo and similar, rather than a company domain.
Keep. Plenty of sole traders and small firms run on one.
Disposable email questions
An address from a service that creates a temporary inbox, usually to get past a signup form. The inbox is abandoned within minutes or hours. They are common in free-trial signups and in any list that was assembled from form fills, and they are worth removing before a campaign because they can never reply.
No, and that limit matters. It compares each domain against a static list of 85 known throwaway services, in your browser. Confirming that a mailbox actually accepts mail requires a server to talk to that domain's mail server, which a web page cannot do. "Not flagged" here means "not on this list", not "this address works".
It depends who you sell to. For enterprise outreach, yes — role mailboxes are shared and rarely reach a decision maker. For local businesses, no: a two-person plumbing firm often publishes only info@ or hello@, and that address goes straight to the owner. This tool separates them so you can decide rather than deleting blindly.
Many of these domains stop accepting mail shortly after the inbox is created, so messages hard-bounce. Mailbox providers read a rising bounce rate as a sign the sender does not know who they are mailing, and start filtering the rest of the campaign — including the addresses that were real.
No list is. New throwaway services appear constantly and this one is static, updated when the site is. Treat a clean result as one check passed, not as verification. If you need a stronger signal, use a source that checks the mail server at the point of collection.
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Start from a list that was checked when it was built
LeadOutreach runs syntax, disposable-domain and live mail server checks on every address before it reaches your export. 7-day Starter trial, then plans from $19/month.