A service can keep your address alive and still delete the message you were waiting for. The two clocks are set independently, and a third condition decides who can read the inbox at all.

The three expiration models at a glance

Temporary email services use three expiration models: a fixed countdown, an address that goes inactive after a session but can be reactivated, and a persistent address whose messages expire on their own schedule. Address activity, message retention, and inbox access are three separate conditions, and one provider can implement more than one model.

Six terms are worth defining before anything else, because using one word for two different things creates confusion.

An active address is one that currently accepts new mail. Message retention is how long an already-received message stays readable. Extension postpones expiration before it happens. Reactivation restores the ability to receive after an address has already gone inactive. Reopening means regaining access to an inbox, which is not automatically the same as reactivation. Persistence means no ordinary time-based address expiration, not a promise that the service or domain will exist forever. The label a service carries answers none of these, and what the words disposable, burner, and throwaway leave unanswered is the subject of its own article.

Duration is not a single provider-level answer. A single brand can run more than one of these models at once, so asking how long a named service keeps things is an incomplete question. The answer depends on which mode and which plan.

One limit applies to everything below: these are published policies, checked on one date, and providers change them.

How the provider policies were verified

Sources were checked on August 8, 2026. For 10 Minute Mail, the source was "10 Minute Mail FAQ." For Temp-Mail.io regular Free, regular Premium, and 10 Minute Mail modes, the sources were "How Long Does Temp Mail Last?", "How to Keep Temp Mail Longer," "How to Access (Recover) Old Temp Mail," and "Email history." Guerrilla Mail was checked against "About GuerrillaMail" and "Compose a new Email"; YOPmail against "Disposable Email Address: Temporary and anonymous inbox" and "Alternate email address: Hide email with an alias"; EmailFake custom-address mode against "Create Your Own Custom Fake Email Address"; TempEmailInbox registered/balance mode against "TempEmailInbox Guide"; and Mailxus against its live configuration, home-page FAQ, and "Reuse a Temp Mail Address With a Token."

Mailxus publishes this comparison and appears in it, which is worth stating plainly. Guerrilla Mail provides a Compose interface, although that page said sending was suspended for the day when checked. Temp-Mail.io Premium documents up to 30 days of message retention and allows selected messages to be saved permanently.

No accounts were created, no test messages were sent, and no delivery or acceptance measurement was performed. This is a documentation review, so nothing below is a measured lifetime.

Fixed-countdown addresses

In this model, the address and its messages expire together, on a clock that starts when you get the address.

10 Minute Mail is a fixed-countdown example. Its default window is ten minutes. A "Give me 10 More Minutes" control resets the countdown before expiration. Its FAQ says all email is deleted at that point, and the address itself stops working one minute later.

That distinction carries the rest of this article. Resetting a running clock is extension. It is not the same capability as bringing back an address that has already gone inactive, and a service that offers one does not necessarily offer the other.

Session-bound addresses that can be reactivated

Here, the address goes inactive after a session and a grace period, but it is not gone: it stays in your history and can be brought back to receive new mail.

Temp-Mail.io's regular mode works this way. The address stays active while the page is open, remains available for a few hours afterward, and then expires. The expired address remains listed in history, and reactivating it makes it accept mail again.

Two nearby services show related lifecycles with complications worth knowing about. EmailFake keeps a custom address for the browser session and lets you reactivate it by re-entering the same username and domain, but old messages are deleted, and another person who picks the same address can see mail arriving at the same time. TempEmailInbox also documents reactivating expired inboxes, but it says that capability requires balance in a registered account, so it is account- and balance-dependent rather than session-bound.

What reactivation restores is the ability to receive. It is not a promise about messages that were already deleted, which is a separate question answered by retention policy.

Persistent addresses with expiring messages

In the third model, the address itself has no ordinary time-based expiration, while individual messages are removed on their own schedule.

Provider and mode	Address-active rule	Expiry event	Pre-expiry extension	Post-expiry reactivation	Default message retention	Inbox access condition
10 Minute Mail	Ten-minute countdown	The timer ends, then the address itself stops one minute later	"Give me 10 More Minutes" resets the timer	Not documented; expired email cannot be recovered	Email is deleted at the end of the countdown	Private, unique inbox in the open window
Temp-Mail.io regular Free	While the page is open, plus several hours afterward	Stops receiving when the grace period ends	No countdown timer	Reactivatable from email history	One day	Email history is stored locally in the browser
Temp-Mail.io regular Premium	While the page is open, plus several hours afterward	Stops receiving when the grace period ends	No countdown timer	Reactivatable from email history	Up to 30 days; selected messages can be saved permanently	Premium account with cloud history synchronization across devices
Guerrilla Mail	Addresses work continuously under the published policy	No ordinary time-based address expiration	Not applicable	Not applicable	Up to one hour in quarantine if unclaimed, then one more hour after moving to an inbox	Anyone who knows the Inbox ID may have access
YOPmail	All inboxes exist and are never deleted	No ordinary time-based inbox expiration	Not applicable	Not applicable	Eight days	Public and password-free
Mailxus	No time limit	No ordinary time-based address expiration	Not applicable	Not applicable	Configuration-controlled; 24 hours at the August 8, 2026 check	Access token stored in the browser

Guerrilla Mail. The provider says its addresses always work, and that mail delivered to the inbox is deleted after one hour. Its policy also describes unclaimed mail spending up to an hour in quarantine, so the one-hour figure is a stated policy rather than a measured end-to-end lifetime.

YOPmail. This one is regularly described incorrectly, including in an earlier draft of this article. YOPmail says its inboxes are never deleted. The eight-day figure is the message retention period, not an address lifetime. YOPmail inboxes are also public and require no password, which matters more than either number.

Mailxus. The address has no time limit. Messages are removed on a schedule set by configuration, currently 24 hours. Inbox access depends on an access token stored in your browser, and a lost token cannot be recovered by anyone, including the Mailxus team.

What "longer" does and does not tell you

Three conditions are being measured here, and they do not move together: whether the address still receives, how long a received message stays readable, and who can open the inbox.

Five documented provider modes compared across address activity, message retention, and inbox access, without an overall ranking.

YOPmail illustrates the distinction. Eight days of message retention in an inbox that anyone can open without a password is not more durable than a shorter window behind a credential. It is longer, and longer is a different property from protected.

So when a service advertises a duration, the useful follow-up is which of the three conditions that number describes, and what the other two are. Those conditions feed a larger decision, and the guide to choosing a temp mail service puts access, return, and retention in the order that settles most jobs.

Which expiration model fits which task

For a code you need within minutes and an address you will never think about again, a countdown is enough, and its short window is a feature rather than a limitation.

If you might need to come back to the same address, you need either reactivation or persistence, and it is worth checking what exactly comes back. Reactivation restores the ability to receive. It does not restore messages that retention already deleted.

If the point is keeping messages available for a while, read the retention figure rather than the address lifetime, and check the plan: the free and paid tiers documented here have different retention periods.

If the task is private, read the access condition first. That is the axis YOPmail shows is separate from duration. On Mailxus, access rests on a token you keep, and there is a page for reopening an inbox with it.

If the combination you want is a persistent address with a credential you hold, you can create a Mailxus address whose only clock applies to its messages.

Frequently asked questions

Is extending a timer the same as reactivating an address?

No. Extension postpones a first expiration that has not happened yet, as 10 Minute Mail's reset control does. Reactivation restores the ability to receive after an address has already gone inactive, as Temp-Mail.io's regular mode allows from history. A service can offer either, both, or neither.

Does reactivating an address restore deleted messages?

Not necessarily, and the two things are governed separately. Reactivation is about whether the address accepts mail again. Whether old messages are still there is decided by that service's retention policy, and on EmailFake the documented behavior is that old messages are deleted.

Does a non-expiring address keep its messages forever?

No, and the two services here that keep addresses indefinitely both delete messages. Guerrilla Mail states a one-hour inbox deletion policy, and Mailxus removes messages on a configured schedule. A permanent address is not permanent storage.

Does closing the browser expire every temporary address?

No, that is specific to the session-bound model. A countdown address runs on a clock rather than on your browser, and a persistent address has no ordinary time-based expiration at all. What closing a browser can affect is something different again: access, if the service keeps your credential in browser storage.