How FastTempMail Works
FastTempMail is a receive-only temporary email service. It uses a Cloudflare-backed mail pipeline to create short-lived inboxes, receive routed messages, show them in your browser, and clean up expired data.
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1. Generate
Create a disposable address
The API creates a temporary address and a private token for your browser. The token is used to read or delete that inbox during its short lifetime.
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2. Receive
Incoming mail is routed
Email sent to the generated address is routed to a Cloudflare Worker. If the inbox is active, the message is stored briefly so it can be displayed to you.
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3. Read
Messages appear in the live inbox
The browser receives live inbox updates and can highlight likely OTP codes, verification links, sender details, and message previews. HTML mail is shown in a restricted viewer.
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4. Cleanup
Expired data is removed
The current retention window is about 15 minutes. A scheduled cleanup process deletes expired inboxes, messages, and attachment metadata.
What happens to attachments?
Attachment files are not provided as downloads in the current inbox. FastTempMail shows attachment metadata such as filename, file type, and size so users know what arrived without opening unsafe files.
Why the service is receive-only
FastTempMail does not support sending email. Receive-only design helps reduce spam and abuse while keeping the tool focused on privacy-preserving signups, OTP codes, and low-risk testing.
What users should remember
Temporary email is helpful for one-time tasks, but it is not a permanent identity. Never use it for important accounts, billing, school, work, healthcare, government services, or password recovery.
What a verification email looks like, start to finish
Here is a typical flow with rough timings. You click Generate and an address such as a7f3k9@fasttempmail.org appears instantly. You paste it into a signup form and submit. The site's mail server sends a confirmation message, which is routed through Cloudflare to our worker within a second or two of the site sending it. Your browser's live inbox is polling, so the message usually shows up within a few seconds of arriving. You open it, copy the six-digit code or click the verification link, and finish the signup. A few minutes later the retention window closes, cleanup runs, and the address and message are gone. Total time in the inbox: often under a minute of actual use.
Limits at a glance
| Direction | Receive only — no sending, replying, or forwarding |
|---|---|
| Retention | About 15 minutes, then automatic deletion |
| Account | None — no signup, login, or password |
| Attachments | Shown as metadata (name, type, size); not downloadable |
| Channels | Email only — no SMS, phone, or WhatsApp codes |
| Cost | Free |
Troubleshooting
- The code isn't arriving. Give it 30–60 seconds, then use the manual refresh. Some senders queue mail. If nothing comes, the site may block disposable domains — see the guide below.
- The signup rejected the address. That site keeps a blocklist of disposable domains. Use a permanent address for that specific account; there is no workaround that respects their rules.
- The inbox emptied on its own. That is the retention window doing its job. Generate a new address and repeat the step you were on.
- I need to open an attachment. The inbox shows attachment details but does not serve files, for safety. Use a permanent mailbox when you genuinely need the file.