Disposable Email Checker

What the checker looks at

1. The list. The domain, and every parent domain above it, is matched against the disposable-email-domains list. The list stores registrable domains, so an address at mail.sub.example.com is matched against example.com too.
2. The mail servers. Your browser asks a public DNS-over-HTTPS service for the domain's MX records, which name the servers that accept its mail. A domain with no MX records, or a null MX record, can't really receive mail.
3. Who runs those servers. If the MX servers belong to a domain on the list, the address is almost certainly disposable even when its own domain is new. Throwaway services often add fresh domains that all point at the same mail servers.

Where the list comes from

The domains come from the open-source disposable_email_blocklist.conf file on GitHub, maintained by volunteers since 2014 and released under CC0, so anyone may copy and use it. Its README quotes PyPI, the Python package index, saying it uses the list to block throwaway domains at sign-up. Anyone proposing a new domain is asked for a screenshot of a site handing out addresses on it.

Our copy has 9,222 domains. The list was last changed on 9 October 2026, and our copy was taken on 9 October 2026. A script refreshes it every time the site is built.

What it can't tell you

• Whether one particular mailbox exists. That needs a conversation with the mail server, which this page does not attempt.
• Whether a domain is brand new and not yet reported. Lists always lag. The MX check narrows the gap but does not close it.
• Whether a person is real. Plenty of people use temp mail for privacy, and plenty of fake accounts use Gmail.

Using the list in your own sign-up form

Download the file from GitHub, load it into a set, and check the address's domain and each parent domain. In JavaScript:

const parts = email.split("@").pop().toLowerCase().split(".");
const isDisposable = parts
  .slice(0, -1)
  .some((_, i) => blocklist.has(parts.slice(i).join(".")));

Refresh your copy every week or so, since the list changes most days. Show a plain message when you refuse an address, such as "Please use an email address you'll keep", so real people know what to do. And leave alias services alone: an address at duck.com or mozmail.com forwards to a real person who simply doesn't want to hand over their main inbox.

A note on our own addresses

This site gives out temporary addresses, and the domains they used were on this list when we checked in October 2026. Sites that check it will refuse them, which is their right. If that happens to you, the email alias guide covers what to use instead. For when to use temp mail at all, start at the temp mail inbox.

Questions