How do I check if an email is a disposable address?

Compare the domain against a list of known throwaway providers. Paste any address or domain into the tool above and it is matched against 9,913 disposable domains. The check is instant because it is a list lookup rather than a network request — there is nothing about the address itself that reveals it is temporary, so detection depends entirely on the quality of the list.

Why do disposable emails pass normal validation?

Because they are genuinely working addresses at the moment you check them. The domain has valid MX records, the mail server accepts the message, and the mailbox exists. Everything a verifier can measure says deliverable. What it cannot measure is that the mailbox will be discarded within hours, which is why disposable detection has to be a separate check from mailbox verification.

Should I block disposable email addresses at signup?

For paid products and trial periods, usually yes: a throwaway address is the standard way to farm repeat trials, and there is no way to reach that user again. For content signups it is a judgement call, since some people use throwaways for legitimate privacy reasons. A middle path is to allow the signup but require a confirmed second address before anything valuable is granted.

How many disposable email domains are there?

More than any one list can hold, and the number moves constantly because new domains are cheap and providers rotate through them deliberately. Our list currently holds 9,913 domains and is refreshed from a file rather than hardcoded, so it can be updated without a code change. Any vendor claiming complete coverage is overstating it.

What is a disposable email address?

A disposable email address is a temporary inbox from a service that hands out addresses with no signup, usually to receive one confirmation email or download. The mailbox is deleted or abandoned soon after, so mail sent to it later bounces or is never read.

Can I check a temp mail address that uses a custom domain?

Only if that domain is on the list. Detection works by matching the domain, so a throwaway service using a brand-new or private domain is not flagged until the domain is added. If you see a burst of signups from one unfamiliar domain, check it here and look at its website.

Are disposable email addresses the same as spam traps?

No. A disposable address belongs to a real person who wanted one message and no relationship. A spam trap belongs to nobody and exists purely to catch senders with poor list practices. Disposables waste your list; spam traps can get your domain blocklisted. Both are reasons to verify before sending, but only one is an emergency.

Disposable email checker

In short: Check whether an address or domain belongs to a known disposable (temporary) email provider. Limit: It matches the exact domain. A brand-new throwaway domain, or a subdomain that is not on the list, is not flagged.

To check if an email is disposable, paste the address or its domain here. This disposable email checker matches the domain against our published list of known throwaway providers and answers instantly. It is free, with no account and no rate limit, because it is a list lookup rather than a network request.

Email address or domain

Checked against 9,913 known disposable domains. No rate limit — this is a list lookup, not a network call.

SimpleAPI

Sample result

acme.example is not a disposable email domain.

Domain: acme.example
Checked against: 9,913 domains
Method: List lookup

What this means for you

Sign-ups from it aren't throwaway inboxes, but each address still needs checking.

Next step:Check the address is real

Accepts an address, a domain or a URL
Matches against our published list
Known providers show how long inboxes last
No DNS or SMTP, so it answers instantly

Disposable
Blocklist
No signup

By SimpleVerifier Team · Last updated October 17, 2026

Why do disposable email addresses pass validation?

Because at the moment you check, they are working addresses. A disposable address is not broken. The domain has real MX records, the mail server accepts the message, and the mailbox genuinely exists. Every signal a verifier can measure says deliverable, because it is deliverable, for as long as the provider keeps that mailbox.

So disposable detection cannot be derived from the address. There is no pattern, no DNS flag, nothing in the SMTP conversation that distinguishes a throwaway from a real mailbox. It is purely a question of whether the domain is on a list, which makes the list the entire product. Ours holds 9,913 domains, loaded from a file beside the verification engine so it can be refreshed without shipping code, with the free providers — Gmail, Outlook and the rest — explicitly subtracted so a real mail host can never be misclassified.

Which disposable email sites should I know about?

These are the throwaway providers people look up by name. Each has its own page explaining how long its addresses last and what to do about them.

Browse all 9,913 blocked domains

How do I check if an email is disposable?

Paste an email address or a bare domain, for example [email protected] or mailinator.com. A pasted URL works too.
Press Check. The tool takes the domain and matches it against our published list of disposable domains. No mail server is contacted.
Read the result. For a well-known provider you also see its name and how long its addresses usually last.
Block or remove disposable addresses where a lasting contact matters. To check whether a real mailbox exists, use the email checker.

Example

You enter: The address or domain acme.example.
You get: Not disposable: the domain is not on our list of 9,913 known throwaway email domains.
Limits: No rate limit and no account; it is a list lookup, so no DNS or mail server is contacted.

Can a normal email verifier detect disposable addresses?

Not on its own. A mailbox check sees a working server and an existing mailbox, so it says deliverable. Disposable detection is a separate list lookup:

	Disposable list lookup (this tool)	SMTP mailbox check
Flags a known throwaway provider	Yes, if the domain is listed	No, the mailbox exists
Finds a mailbox that does not exist	No	Yes
Contacts a mail server	No	Yes
Rate limit on this site	None	Five a minute

The email checker runs both, so a disposable address comes back invalid even when its mailbox answers.

Who uses this tool, and for what?

SaaS signups: Check the domains behind suspicious signups, such as a burst of new accounts claiming the same offer. Then block them at the form; see how to block disposable emails at signup.
Marketers: Find out why a lead magnet's list has a poor open rate: throwaway addresses collect the download and are gone before the first nurture email.
Sales ops: Before a demo request reaches a rep, check whether the address is a throwaway. A disposable address on a demo form is rarely a buyer.

What can’t this tool tell you?

It matches the exact domain. A brand-new throwaway domain, or a subdomain that is not on the list, is not flagged.
New disposable domains appear all the time, so no list is complete. A clean result means the domain is not on our list, not that it is a real provider.
Plus addresses ([email protected]) and email alias services at real providers are not disposable domains and are not flagged. Plus addressing is a standard feature, described in RFC 5233.
It does not check whether a mailbox exists. A real-looking domain can still host an address that bounces.

Sources

RFC 5233: Sieve subaddress extension (plus addressing)

Is there a disposable email checker API?

Yes. The SimpleVerifier verification API runs the disposable check in the same call as the syntax, domain and mailbox checks, and returns “Disposable address” as the reason when the domain is on the list. That is the version to put behind a signup form, so a throwaway address is caught before the account is created. See how to block disposable emails at signup, or copy a drop-in recipe for Supabase, Clerk, Firebase, Next.js and more.

Common questions

How do I check if an email is a disposable address?: Compare the domain against a list of known throwaway providers. Paste any address or domain into the tool above and it is matched against 9,913 disposable domains. The check is instant because it is a list lookup rather than a network request — there is nothing about the address itself that reveals it is temporary, so detection depends entirely on the quality of the list.
Why do disposable emails pass normal validation?: Because they are genuinely working addresses at the moment you check them. The domain has valid MX records, the mail server accepts the message, and the mailbox exists. Everything a verifier can measure says deliverable. What it cannot measure is that the mailbox will be discarded within hours, which is why disposable detection has to be a separate check from mailbox verification.
Should I block disposable email addresses at signup?: For paid products and trial periods, usually yes: a throwaway address is the standard way to farm repeat trials, and there is no way to reach that user again. For content signups it is a judgement call, since some people use throwaways for legitimate privacy reasons. A middle path is to allow the signup but require a confirmed second address before anything valuable is granted.
How many disposable email domains are there?: More than any one list can hold, and the number moves constantly because new domains are cheap and providers rotate through them deliberately. Our list currently holds 9,913 domains and is refreshed from a file rather than hardcoded, so it can be updated without a code change. Any vendor claiming complete coverage is overstating it.
What is a disposable email address?: A disposable email address is a temporary inbox from a service that hands out addresses with no signup, usually to receive one confirmation email or download. The mailbox is deleted or abandoned soon after, so mail sent to it later bounces or is never read.
Can I check a temp mail address that uses a custom domain?: Only if that domain is on the list. Detection works by matching the domain, so a throwaway service using a brand-new or private domain is not flagged until the domain is added. If you see a burst of signups from one unfamiliar domain, check it here and look at its website.
Are disposable email addresses the same as spam traps?: No. A disposable address belongs to a real person who wanted one message and no relationship. A spam trap belongs to nobody and exists purely to catch senders with poor list practices. Disposables waste your list; spam traps can get your domain blocklisted. Both are reasons to verify before sending, but only one is an emergency.

Disposable detection answers one question. To find out whether a mailbox actually exists, use the free email checker — and for a whole list at once, see pricing.

Embed this tool on your site

Paste this code into any page to give your readers the disposable email checker for free. The frame resizes to fit and works on light and dark pages. Keep the link under it so readers can find the full guide. More tools to embed are on the embeddable tools page.

HTML

<iframe src="https://simpleverifier.com/embed/tools/disposable-email-checker" title="Disposable email checker by SimpleVerifier" data-sv-embed="disposable-email-checker" width="100%" height="640" loading="lazy" allow="clipboard-write" style="border:0;width:100%;max-width:760px;display:block"></iframe>
<p style="margin:6px 0 0;font-size:13px"><a href="https://simpleverifier.com/tools/disposable-email-checker">Free disposable email checker by SimpleVerifier</a></p>
<script>(function(){if(window.__svEmbed)return;window.__svEmbed=1;window.addEventListener("message",function(e){if(e.origin!=="https://simpleverifier.com")return;var d=e.data;if(!d||d.type!=="simpleverifier:embed-height"||typeof d.slug!=="string"||typeof d.height!=="number"||!isFinite(d.height))return;var f=document.querySelectorAll("iframe[data-sv-embed]");for(var i=0;i<f.length;i++){if(f[i].contentWindow===e.source){f[i].style.height=Math.min(Math.max(Math.ceil(d.height),200),4000)+"px";}}});})();</script>

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

Get started — $39/mo See the published limits first

Plans from $9 a month, 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.

SimpleAPI

Sample result

acme.example is not a disposable email domain.

Domain: acme.example
Checked against: 9,913 domains
Method: List lookup

What this means for you

Sign-ups from it aren't throwaway inboxes, but each address still needs checking.

Next step:Check the address is real

Accepts an address, a domain or a URL
Matches against our published list
Known providers show how long inboxes last
No DNS or SMTP, so it answers instantly

Disposable
Blocklist
No signup

Verify the whole list

$39/ month

Email verification with real SMTP checks, never cut off: the first 100,000 a month run at full speed. CSVs up to 100,000 rows.

Get started — $39/mo

See the published limits first

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