Four of the six disposable email services tested on 25 October 2026 worked free with no signup, and the differences between them come down to lifetime, recovery, and stated limits — not marketing promises. Two services could not be verified end to end in this round, and this comparison says so plainly rather than filling gaps from their homepages.
The Comparison
| Service | Signup needed | Custom address name | Lifetime (as observed or stated) | Attachments | Reopen later | Tested? |
|---|---|---|---|---|---|---|
| Temp-Mail | No | Premium only | Valid until deleted or domain list changes (FAQ) | Not verified | Same session only, no token | Yes |
| 10 Minute Mail | No | No | 10 minutes, extendable by button | Not verified | No | Yes |
| AdGuard Temp Mail | No | No | 7 days inactive, up to 6 months with use | No (stated) | Yes, via cookies | Yes |
| Internxt Temp Mail | No | No | 3 hours of inactivity | Not verified | No token shown | Yes |
| mail.tm | Claims none | Not verified | Until deleted by user; messages 7 days (FAQ only) | Not verified | Not verified | No — address never rendered |
| Guerrilla Mail | Not verified | Not verified | Not verified | Not verified | Not verified | No — site unreachable |
Temp-Mail: The Longest-Lived Free Inbox in This Test
Temp-Mail generated an address automatically on its homepage with no sign-in. Its FAQ states the address stays valid until deleted or until the service changes its domain list, with no extension step needed — the most forgiving lifetime here.
A custom address name is Premium-only, priced at $10/month on the page visited, alongside custom domain connection, dedicated premium domains, up to 10 addresses at once, and 100 MB message storage. The free tier showed no shareable token or recovery link, and the same address reappeared only in the same browser session. Attachment support could not be verified: no message arrived, and the checked pages stated no rule for free inboxes.
10 Minute Mail: The Shortest Clock, by Design
10 Minute Mail showed a random address immediately with a live countdown starting at 9:59 and a “10 more minutes!” button to extend it. Its FAQ states no signup or personal information is needed, and that after expiry all email is deleted, the address stops working, and lost mail is unrecoverable.
This is the right tool for exactly one job: a code arriving within minutes. Anything with a second step or a delayed message falls outside its clock. Repeated extension presses and attachment support could not be verified.
AdGuard Temp Mail: The Most Explicit Limits
AdGuard Temp Mail states “no account needed” on its overview page, and clicking “Get address” produced a working address and inbox. Its limits are the most clearly stated of any service tested: auto-deletion after 7 days of inactivity, up to 6 months with regular use, and a new address deletes the old inbox immediately. The FAQ also states the free widget does not accept attachments; attachment support belongs to the separate AdGuard Mail product, which was not tested.
Return visits work through cookies — the FAQ says the site uses cookies to remember the address and warns against deleting them — but restart survival was not tested, and deleted messages and mailboxes cannot be recovered.
Internxt Temp Mail: Three Hours, With a Routing Quirk
Internxt’s tool worked free with no sign-in, but only at internxt.com/temporary-email: the shorter internxt.com/temp-mail path first rendered blank and then redirected to an offer page, while the site’s footer link labelled “Temporary Email” led to the working tool. There, a random address and inbox were generated with no account step.
The tool page states the address and inbox expire after 3 hours of inactivity — enough for a trial signup or short-queue download, not a multi-day task. No custom name control appeared — only “Change email” for a new random address — and no recovery token or link.
The FAQ says refreshing generates a new address and deleted emails cannot be recovered. A banner offered a free 1 GB account signup; it was not used and is not required. Attachment support could not be verified.
mail.tm: Claims Not Confirmed by This Test
Mail.tm’s homepage claims a mailbox is created automatically the moment the site opens, with no personal details required, and its FAQ says no registration is needed. In this test session, however, the address field stayed as “…” and no usable address rendered, even after rejecting cookie consent and reloading once — so no part of the free flow was confirmed.
Its FAQ-stated terms are reported here only as FAQ claims, not tested facts: the mailbox stays valid until deleted by the user, incoming messages are stored for 7 days only, and the password is generated in the browser, stored encrypted, and cannot be reset if forgotten. Until a later test produces a working address, mail.tm cannot be ranked against the four that worked.
Guerrilla Mail: Not Tested This Round
Guerrilla Mail could not be reached at all in this session: both the www and bare domains returned a connection-reset error, and no page, address, inbox, or FAQ loaded. Nothing about the service is verified here. It stays here as an explicit gap, not a ranking.
Which Service Fits Which Job
- A code arriving now: 10 Minute Mail — ten minutes covers a single verification step.
- A trial or signup spanning hours: Internxt Temp Mail, with its 3-hour inactivity window.
- A task spanning days: AdGuard Temp Mail, with up to 6 months of regular use and the clearest stated limits.
- An address to keep open indefinitely: Temp-Mail’s free tier, per its FAQ — recovery beyond the same session is Premium-gated and unconfirmed.
- Anything with money, identity, or recovery value: none of these. Use an alias that forwards to an inbox under your control instead.
How This Was Tested
All six services were visited live in a browser on 25 October 2026. No personal email address, phone number, or payment details were entered, and nothing was purchased or signed up for on a paid plan. No test message was sent to any inbox, so attachment handling is confirmed only where a service stated its own rule — AdGuard’s no-attachments rule is the single confirmed case. Guerrilla Mail was unreachable, mail.tm’s address never rendered, and each unverified point is marked as such above.
Final Verdict
Temp-Mail, 10 Minute Mail, AdGuard Temp Mail, and Internxt Temp Mail all deliver a working free inbox with no signup; the choice between them is a clock decision: ten minutes, three hours, days to months, or open-ended per the FAQ. AdGuard earns the recommendation for multi-day tasks: its limits are stated plainly and its cookie-based return path is documented. Temp-Mail suits the longest free use, with its recovery limits understood. Mail.tm and Guerrilla Mail are not ranked here: inventing results for services this test could not verify would be worse than no comparison at all.
