It depends on the service
"Temp mail" is a category, not one product. 10 Minute Mail lasts about ten minutes with an extend button. Guerrilla Mail keeps mail for roughly an hour. YOPmail inboxes can persist for days because the addresses are fixed and reusable. Each picks a different balance between convenience and how long a public address stays readable.
Longer lifetimes are handy when you have to wait for a link, but they also mean a public inbox stays open to anyone who knows the address for longer. Shorter lifetimes limit that exposure.
How long this inbox lasts
Here the timer is five minutes. That is enough for the vast majority of verification codes, which arrive within seconds. When the countdown reaches zero, the address stops receiving mail and everything in the inbox is permanently deleted — there is no extend button and no recovery.
If a site is slow and your five minutes run out, simply generate a new address from this page and request the code again. It is deliberately short so leftover mail never accumulates on a public address.
Lifetimes at a glance
Retention is the one number that genuinely differs between services, so it is the number worth comparing. Treat these as the published intent rather than a guarantee; providers change them.
- This service — 5 minutes: hard timer, no extension, address and mail deleted. The shortest of the group, deliberately.
- 10 Minute Mail — about 10 minutes: with a button to extend the countdown if you need longer.
- Guerrilla Mail — around an hour: the usual pick when you have to come back to a link rather than read a code immediately.
- YOPmail — days: because addresses are fixed and reusable rather than generated. Convenient, and guessable by anyone.
- Mailinator — hours, publicly: inboxes are addressed by name and readable by anyone who types that name. Built for team testing.
Making the most of a short window
Request the verification email only after the address appears and you have pasted it correctly, so the whole exchange happens inside the window. Keep this tab open and watch the inbox rather than navigating away.
Do not use a short-lived address for anything you might need later — password resets, account recovery, or receipts you want to keep. Once it expires, that mail is unreachable.
What happens at the moment it expires
Expiry is not a soft state. When the countdown reaches zero the mailbox record and every message in it are deleted, so the address stops being a place mail can go rather than becoming an inbox that is merely hard to reach. Mail sent afterwards is refused at the door.
That means there is no grace period, no archive, no trash folder, and no support request that can retrieve a message — nobody holds a copy, including us. It also means the address is not reserved: nothing links it to you, so there is no way to prove an expired inbox was yours or to reopen it later.
The practical consequence is that a code arriving a second late is simply lost, and the fix is always the same: generate a fresh address and ask the sender to try again, rather than waiting on the old one. Copy anything you need out of the inbox while the timer is still running.
Why a longer lifetime is not simply better
It is tempting to treat retention as a feature and pick the service that keeps mail longest, but the trade is real. None of these inboxes has a password, so the lifetime is also the length of time a readable mailbox sits exposed to anyone who knows or guesses the address. Five minutes of exposure is a meaningfully smaller window than five days.
Predictability compounds it. Services with fixed, reusable addresses are the most convenient to return to and the easiest for a stranger to open, because the address is the only thing protecting the contents. Random addresses with short timers sit at the opposite end.
The practical rule: pick the shortest lifetime that still comfortably covers the mail you are expecting. For an automated code arriving in seconds, that is minutes. Reaching for days of retention to be safe achieves the opposite.