How Long Do Temporary Emails Last? A Guide to Expiry and Retention

The answer varies by provider, but the underlying logic is consistent enough to explain once and have it apply almost everywhere: a temp address lives for a bounded window, and once that window closes, it's gone. Not archived, not recoverable, actually gone.

zephbox's default window

Free-tier addresses on zephbox default to 24 hours. That's long enough to cover the overwhelming majority of real use cases, like signup confirmations, OTP codes, and one-time downloads, without leaving stale inboxes sitting around indefinitely. If you need more time mid-session, the extend option adds another 24 hours, and you can do that repeatedly as long as you're actively using the address.

Why not just make it last forever?

Because "forever" is a real cost, not a free feature. Every inbox a provider keeps alive indefinitely is infrastructure it has to maintain and storage it has to pay for, multiplied across every user who never comes back to actually delete theirs. Bounded expiry isn't a limitation imposed to annoy you; it's what makes the free tier of a service like this sustainable to run at all. Premium accounts get extended retention specifically because that's the trade-off being made explicit: pay, and we'll keep more history around longer.

What happens at the exact moment of expiry

The address stops accepting new mail, the existing messages are deleted from the database, and the alias itself becomes available to be regenerated by someone else later. There's no grace period, no "recover within 30 days" option. Once the timer hits zero, whatever you needed from that inbox needed to already be saved somewhere else.

The one thing worth doing before it expires

If there's anything in the inbox you might need to reference later, like a confirmation number, a receipt, or a code you're not 100% sure you've used correctly, copy it out or screenshot it before the countdown runs out. Treat the inbox as genuinely temporary in the literal sense, because it is.

Curious about the data-retention side of this from a privacy angle? See what "zero logs" actually means and how it applies once an address expires.