Use cases
What email to use for AI services
Disposable addresses mostly fail here, and not by bad luck. Once you know what is actually being checked, the right kind of address is obvious.
Where you are
You are probably running into these
“This email is not supported”
The signup form says the address is unsupported, and a different temp mail gives the same message. This is not a network glitch — the domain itself is on a blocklist.
It worked, then the account vanished
The temp inbox expires and takes password resets, verification codes and billing notices with it. The account still exists; you just cannot get back into it.
You would rather not hand over your main inbox
These accounts carry your payment method and your conversation history. Signing up with your main address ties all of it to your real identity — and signs you up for the marketing list too.
Mechanism
What is actually being checked
Services like OpenAI run two lists at once: the public disposable-domain blocklists, plus an internal one they build themselves. A hit on either is an instant rejection. On top of that they check whether the domain has valid MX records and genuinely accepts mail, which rules out services that spin up throwaway domains. Both lists are refreshed weekly, so any public temp-mail service with real traffic gets listed sooner or later. Switching providers or domains just moves that date a few days out. The real dividing line is not “which temp mail is still unblocked” — it is whether the domain is a normally operating one that accepts mail and has a sending history.
What to do
Step by step
- 01
Use a long-lived alias, not a throwaway
These accounts are meant to be logged into for months, and both password resets and billing run through email. A long-lived anonymous alias stays valid instead of burning down on a timer.
- 02
Turn on forwarding so mail lands where you already look
Point the alias at the inbox you actually check. Codes and invoices arrive where you already are, so there is no second inbox to remember.
- 03
One alias per service
A separate one for ChatGPT, Claude, Midjourney. If any of them starts spamming or gets breached, you switch off that single alias and the rest are untouched.
- 04
If the filters are aggressive, bind your own domain
Members can issue aliases on a domain they own. Your own domain has its own MX records and sending history and appears on no disposable list, which is the most durable answer to this kind of check.
Watch out
Easy things to miss
The blocklists move every week
A temp domain that works today may not next week. Any free service promising it will “always work” is describing the present, not making a promise about the future.
The phone number is a separate gate
Some AI services also want a phone number, and no email address solves that gate — it needs a cloud number. The two are separate problems.
Never put billing on an expiring address
Invoices, charge notices and suspicious-login alerts all arrive by email. Once the address dies, you have no way back in when something goes wrong.
FAQ
Questions about this case
Why was my temp mail rejected by ChatGPT?
Because that domain is on a disposable-email blocklist. These services check public lists plus their own, and a hit is an immediate refusal. Another temp-mail provider usually buys you a while, since any service with real traffic ends up listed eventually.
Will a NexMask alias be treated as disposable?
A long-lived alias has proper MX records and genuinely receives mail; it does not behave like a page that hands you an address which disappears ten minutes later. If a particular platform is unusually strict, binding your own domain is the sturdier answer — your own domain appears on no disposable list.
When is a disposable address still fine?
When you need one code and will never log in again — grabbing a download, claiming a one-off offer. Not for any account you intend to keep.
Can an anonymous alias get the account banned?
Rejection and suspension are different things. The domain check at signup is aimed at throwaway addresses; once a long-lived alias clears it, whether the account survives depends on how you use it, not on the address being an alias.
The features this case uses
Start with one address
Free users can take a disposable address with no signup and no phone number. Long-lived aliases and custom domains are for the accounts you intend to keep.