Last updated 07-30-2026
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TempMail Online
TempMail Online gives you a disposable email address in the browser without creating an account. Visiting tempmailonline.co loads a live mailbox where you pick any username on one of 26 domains, copy the address, and read incoming mail as it arrives.
Most temp mail sites hand you a random address and hide the API. TempMail Online (served via fmail) lets you choose the local part, lock an inbox with a password, and hit a public REST API at fmail.men/v1 with no API key. That combination suits scripted signup tests and OTP harvesting more than a basic web-only burner inbox.
It fits software testers, privacy-minded signups, and developers who need quick verification codes from throwaway addresses. The trade-off is security: anyone who guesses your username on the same domain can read the inbox unless you enable password protection.
Pick any username across 26 disposable domains with no signup or captcha
Inbox auto-refreshes so verification codes appear within seconds
Mail expires after 12 hours, capped at 50 messages per inbox
Optional password lock to protect an inbox from casual readers
Free REST API at fmail.men/v1 with CORS and no API key required
Receive-only addresses for signups, downloads, and one-shot logins
Free with no account or captcha required
Public REST API supports scripted OTP and signup testing
Choose custom usernames across 26 domains instantly
Optional password lock adds basic inbox privacy
Inboxes are semi-public without password protection enabled
Receive-only service with no outbound sending
Attachment files are not displayed in the web inbox
tempmailonline.co redirects to fmail.men branding
Is TempMail Online free to use?
Yes, TempMail Online is completely free. There is no signup, no paid tier, and the companion REST API at fmail.men/v1 is also free with no API key required.
Can you send email from TempMail Online?
No, TempMail Online only receives mail. The service is inbound-only, so you cannot send outbound messages from a disposable address.
How long does mail stay in a TempMail Online inbox?
TempMail Online keeps messages for up to 12 hours per inbox, with a cap of 50 emails. Older messages drop off automatically once the limit or time window is reached.
Who can read a TempMail Online inbox?
Anyone who types the same username on the same domain can read that TempMail Online inbox. Treat addresses as semi-public unless you enable the optional password lock.
Does TempMail Online have an API?
Yes, TempMail Online exposes a public REST API at https://fmail.men/v1 for generating addresses, listing inboxes, and fetching email bodies. No authentication is required and CORS is open.
Do attachments work on TempMail Online?
TempMail Online displays the email body text, but attachment files are not shown in the inbox UI. If you need a file, ask the sender for a direct download link instead.