"Disposable email" and "temporary email" are used interchangeably in everyday speech, but they carry slightly different emphases. "Disposable" stresses the intent to discard; "temporary" stresses the limited lifespan. In practice they describe the same thing: a short-lived inbox you use once and let expire.
How disposable addresses work
A disposable email service owns one or more domains and configures them with a catch-all MX record. Any address on those domains receives mail. The service generates a random local part for each visitor, shows the inbox in a browser, and deletes everything when the session ends.
Why services block disposable email
Because disposability undermines the assumptions platforms make about identity. If anyone can create unlimited fresh addresses in seconds, free-trial limits, vote counts, referral programmes and anti-spam measures all become trivially bypassable. Services respond by maintaining blocklists of known disposable domains and rejecting addresses on them.
This is not a technical arms race worth joining. A site that blocks disposable addresses is signalling that the account is meant to be durable — which means the inbox was the wrong tool anyway.
Disposable versus alias addresses
An alias (e.g. yourname+shopping@gmail.com or a service like SimpleLogin) is tied to your real inbox. Mail to the alias arrives in your permanent mailbox. You can disable the alias, but the history is yours indefinitely. A disposable address is completely detached: it has no connection to your real identity, and it genuinely ceases to exist when it expires.
| Disposable | Alias | |
|---|---|---|
| Linked to real inbox | No | Yes |
| Survives expiry | No | Yes (until disabled) |
| Can reply from | No | Sometimes |
| Detectability | High (domain blocklists) | Lower |