In 2026, there are well over 130,000 disposable email domains in active use. New ones launch every week. Sharing a blocklist text file on GitHub used to be enough; it is not anymore. Here is the current operator landscape and the strategy that actually keeps fakes out of your signup flow.
The biggest disposable services
- Mailinator. The OG. Public-inbox model: anyone can read mail to
anything@mailinator.com. Used heavily for testing and trial abuse. - TempMail.io / temp-mail.org. Privacy-focused, refreshes every few hours.
- 10MinuteMail. Self-expiring, designed to last just long enough for one confirmation email.
- Guerrilla Mail. Long-running, supports replies.
- YOPmail. French-origin, very popular in EU markets.
- Maildrop. By Heluna, focuses on developer testing.
- SimpleLogin / DuckDuckGo Email Protection / Apple Hide My Email. Privacy-first forwarding services that look disposable but actually forward to a real inbox.
The DuckDuckGo and Apple wrinkle
Apple Hide My Email and DuckDuckGo Email Protection look like disposable addresses (random@duck.com, random@privaterelay.appleid.com) but they forward to the user's real Apple ID or DuckDuckGo account. These are not disposable in the abusive sense. They are real users who care about privacy. Blocking them blocks paying customers.
Good verifiers distinguish: MailoClean marks these as valid while marking actual disposable services as disposable.
Why a static blocklist breaks
If you just download the popular open-source disposable list and check signups against it, you catch maybe 60% of disposable signups. The other 40% use domains registered in the last 14 days, or rotate through hundreds of throwaway subdomains. By the time your list is updated, the attacker has moved on.
What works
- A dynamic, frequently-updated blocklist. Daily refresh minimum. MailoClean updates ours from multiple feeds and our own honeypot signups every few hours.
- MX fingerprinting. Many disposable services share hosting infrastructure. Fingerprinting the MX target catches new domains the moment they launch.
- Behavioral signals. Random-looking local parts, very-recently-registered domains, no website at the apex. Each is a soft signal; combined they predict disposable use with high accuracy.
- Real-time verification. Plug the verification API into your signup form. The decision is made before the account exists.
What to do at signup
Reject with a clean error: "Please use a permanent email address." Let users try again. Many disposable signups are bots that will fail; the small number of humans who reach for a disposable will retry with a real address when nudged.
If your product genuinely wants to serve privacy-conscious users, allow Apple Hide My Email and DuckDuckGo forwarding explicitly. Block only services where the inbox truly disappears.
Should you allow disposable on the free tier?
Depends on the product. If trial abuse is a major problem (one user creates 50 accounts), block everywhere. If your free tier has natural limits that make abuse pointless, allow disposable and only block on paid signups.
FAQ
How big is the MailoClean disposable list?
130,000+ domains, updated several times per day.
Are disposable signups always bots?
No. Many are real humans testing your product without committing. Whether to block them is a product decision.
Block them at the door
Wire MailoClean into your signup form. Disposable check happens in the same call as verification; no extra integration.