Bulk disposable email checker: find temporary emails in a list
A bulk disposable email checker flags every address in a list that uses a temporary or throwaway email service. This one checks each domain against a list of 9,913 disposable domains and reads its MX records, so a domain that isn't listed but sends its mail to a disposable service is caught too. You download the list with those rows removed.
Sample result
2 of 4 addresses in this list use a disposable domain.
- List
- 4 addresses
- On the list
- 1
- Disposable MX
- 1
What this means for you
Download the clean list to drop them, then verify the addresses that are left before you send.
- Disposable list plus each domain's MX owner
- Flags domains that can't receive mail
- 1,000 domains a run, 5,000 signed in
- Clean list and full report as CSV
- Disposable
- MX
- CSV
By SimpleVerifier Team · Last updated
How do I remove disposable emails from a CSV?
- Paste email addresses, one per line, or upload a CSV; the email column is found for you.
- Press Check for disposable emails. Only the unique domains are sent, a hundred at a time, never the full addresses.
- Read the result for each address: disposable domain, mail handled by a disposable service, domain can't receive mail, or not disposable.
- Download the clean list, or the full report with the reason for every row.
Example
- You enter
- A CSV with an email column:
jane@acme.example,sam@mailinator.com,lee@gmail.comandpat@temp-inbox.example. - You get
sam@mailinator.comis a disposable domain (Mailinator).pat@temp-inbox.exampleisn't listed, but its MX host sits under a listed disposable service, so it's flagged too.lee@gmail.comandjane@acme.exampleare not disposable. Download the clean list of 2 or the full report.- Limits
- No cap on addresses; up to 1,000 unique domains a run without an account and 5,000 when signed in with Google. Only domains are sent, and no mail server is contacted.
How does it tell a disposable email apart?
Two checks per domain. First, the domain is looked up in our list of 9,913 disposable domains: a snapshot of a public CC0 list, with real mail providers such as gmail.com and outlook.com removed so they can never be flagged. Second, the domain's MX records are read. Some throwaway services hand out fresh domains that point their mail at the service's own servers, so a domain whose MX host sits under a listed disposable domain is flagged as well, and the row names that host.
A domain with no mail server at all, or a null MX record that says it accepts no mail, isn't disposable but can't receive anything either. Those rows are marked separately so you can drop them too.
Is my list uploaded?
No. The file is read in your browser, and only the unique domains (the part after the @) are sent to our server for the list and MX lookups. The addresses themselves never leave your device, and nothing is stored.
Why remove disposable addresses before sending?
A temporary inbox is usually gone within hours or days. Mail sent to it later bounces or lands in an inbox nobody reads, and some services publish their inboxes so anyone can read them. Either way it costs sends and reputation and brings no reply. If they came from a signup form, they're also a sign of trial abuse; stopping them at signup is cheaper than cleaning them out later.
What can't it catch?
New throwaway domains appear every day and no list has all of them. A domain that isn't listed and runs its own mail servers passes this check. Disposable services that let people forward to a real inbox (alias services) aren't on the list on purpose, because the mail does reach a person. And a real domain doesn't mean a real mailbox: that needs a verification against the mail server.
How is this different from the single disposable email checker?
| Bulk checker | Single checker | |
|---|---|---|
| Input | A pasted list or a CSV | One address or domain |
| Checks | Disposable list, MX owner and mail server | Disposable list, with the provider's details |
| Output | Clean list and full report as CSV | One answer with an explanation |
| Best for | Cleaning an export before sending | Looking up one suspicious signup |
Who uses this tool, and for what?
- SaaS signups
- Find trial accounts created with throwaway inboxes before they skew activation numbers.
- Email marketers
- Strip temporary addresses from an export before a campaign, so they don't bounce or sit unread.
- Ecommerce
- Spot fake customer accounts and coupon abuse in an order or customer export.
- Lead buyers
- Check a purchased or scraped list for filler addresses before you pay for verification.
What can’t this tool tell you?
- Only domains on the list, or whose MX points at a listed service, are flagged; brand-new throwaway domains can pass.
- Alias and forwarding services that reach a real inbox aren't treated as disposable.
- It doesn't check whether a mailbox exists; that needs a verification.
- Up to 1,000 unique domains a run without an account, 5,000 signed in.
Common questions
- How do I check a list for disposable emails?
- Paste or upload the list here. Each address's domain is checked against 9,913 known disposable domains and its MX records, and you download the list without the disposable rows.
- How many emails can I check at once?
- There's no cap on addresses. The limit is unique domains: 1,000 a run without an account and 5,000 when signed in with Google. A list of 50,000 addresses usually holds far fewer unique domains.
- Is this bulk disposable email checker free?
- Yes. It's a free tool with no card. Signing in with Google only raises the number of domains a run.
- Does it check whether the mailbox exists?
- No. It checks the domain, not the mailbox. To know whether each address can receive mail, run the list through email verification after removing the disposable rows.
- Why is an address on a domain I don't know marked disposable?
- Either the domain is on the list, or its MX records point at a listed disposable service's mail servers. The row shows which, and the host it found.
- Is gmail.com or outlook.com ever flagged?
- No. Real mail providers are removed from the list before any check, so a personal Gmail, Outlook or Yahoo address is never called disposable.
Sources
Disposable detection is one check of several.
A domain can be perfectly ordinary and the mailbox still fake. This tool cannot tell you that.
- Real SMTP mailbox checks on every row of a list
- All 9,913 disposable domains applied automatically
- Catch-all and role-address detection alongside it
One plan, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.