Username Checker for Temporary Email

Check a mailbox username

This checker runs in your browser. It does not send the username to the server or confirm whether an address is available.

Proposed username

Use 1–20 ASCII letters and/or digits in any order. Spaces and symbols are not allowed. This is a format check, not an availability check.

Enter a username to check its format and get practical guidance.

Need an idea?

Generate suggestions in the same style as the standard inbox: a familiar name plus a number from 1–100. Use Locked Inbox if you want a temporary exclusive claim.

Two ways to use a temporary inbox

The homepage is the standard mode. It is fast and has no exclusive username claim: messages belong to the email address, so anyone who knows or guesses the same address may see its messages. Do not treat the address as a password.

Locked Inbox is a separate mode. It reserves an available address to one browser session while its page sends heartbeats. The claim ends after inactivity and has a hard three-hour maximum. A claim prevents other Locked Inbox sessions from claiming that same address during the active lease, but does not make the service end-to-end encrypted or suitable for secrets.

Choose the mode that fits the task. Use standard mode for convenience and low-risk tests; use Locked Inbox when you want a short exclusive claim. Keep sensitive or recoverable accounts on a mailbox you control long-term.

How to choose a username

Allowed format: 1–20 ASCII letters and/or digits, in any order.
Reserved values: administrative and service names are blocked to avoid confusion and abuse.
Standard-style suggestions: the generator uses a familiar name plus a number from 1–100, matching the homepage format.
Availability: format checks run locally. A standard username can refer to a shared address; Locked Inbox checks whether an exclusive claim is currently active.

Limits to understand

Locked claims depend on a browser cookie and the page staying active. Clearing site data or changing browser profiles may end your access. The maximum claim is three hours; after it ends, another visitor may claim that address. Neither mode should be used for banking, healthcare, important account recovery, or confidential information.