“Not received” is only the outcome, not the cause. The most effective approach is to start with the address you can verify immediately, then work through sender restrictions. Decide whether to resend only after each step, so new codes don’t replace older ones.
1. Copy the full address again
Go back to the PostTmp disposable email tool, click the copy button, and paste the address into a plain-text field. Check the characters around @, trailing spaces, and whether your phone’s keyboard changed half-width symbols to full-width ones. Long random prefixes are especially easy to mistype, so copying again is more reliable than scanning the address by eye.
If the signup page saved the wrong address, correcting the field alone usually won’t generate a new email. First confirm that the address in your account details is updated, then request a new code once. Don’t keep sending messages to an address you know is incorrect.
2. Give the sender’s queue two minutes
After you click “Send,” the website may still need to run fraud checks, generate the message, and process its email queue. Promotions, traffic spikes, and service outages can extend this stage, so an unchanged inbox doesn’t necessarily mean the address is unusable. Keep the page open: PostTmp refreshes periodically, and you can also refresh it manually after waiting.
Wait 60–120 seconds for a standard verification code. During high-traffic events, wait up to 5 minutes. If no email arrives after that, move to the next step instead of resending every few seconds.
3. Resend once, and use only the latest code
Many systems invalidate the old code as soon as you resend. Sometimes the first email arrives after the second, and the later-arriving message contains an expired code. Use the code tied to your “most recent request,” and check whether the email states how many minutes it remains valid.
If the page says “Too many attempts,” stop and wait for the cooldown. Repeated requests can trigger rate limits and make troubleshooting impossible: you won’t know which request the code belongs to.
4. Confirm the inbox still uses the same address
Compare the address on the signup page with the address bar in PostTmp and make sure they match exactly. Don’t click “Get a new address” while waiting. If refreshing the browser restores a different address, messages sent to the old inbox won’t move automatically. The address countdown should also still be within its active period.
If you need more time, use “Extend by 3 hours.” This only extends the current address’s availability window. It won’t make the sender deliver again or restore an address that has already expired.
5. Check whether the sender blocks disposable domains
Some financial, government, business collaboration, and high-risk platforms check the email domain during submission. Common signs include a direct “Email not supported” message, an immediate error after submission, or a site that sends instantly to a long-term email but never creates a delivery record for a disposable address. Switching prefixes repeatedly won’t help because the restriction targets the domain category.
Don’t try to bypass the sender’s explicit identity rules. If an account holds money, contracts, or identity-verification records, use an email address you control long term and can recover.
6. Test the sending system with another notification
If the site also supports a sign-in link, password reset, or security notification, choose another email type without changing the address. If none arrive, the issue is more likely the address policy or sending system. If only one type fails, that template or queue may be having trouble.
You can also check the sender’s status page or official help center for reported email delays. PostTmp can only display messages already delivered to the current inbox; it cannot generate a verification code for a message that hasn’t been sent.
7. Only then decide whether to change the address or tool
If you only need a public download and the site doesn’t explicitly reject disposable email, create a new address and submit the form again from the beginning. If the account may later be used for password recovery, order records, subscription renewals, or security alerts, stop using a short-term address and switch to a manageable forwarding alias or your long-term email address.
one-time trials, short surveys, and public downloads; if it fails, you can start over without losing anything.
paid accounts, work information, order records, and password recovery; losing access later can cause real harm.
30-second checklist before sending
- Get the address from the copy button instead of typing it manually.
- Confirm that the signup page saved the correct address before clicking Send.
- Wait at least 60 seconds before resending once.
- Make sure the inbox address hasn’t changed and the countdown is still active.
- Use the code tied to the most recent request.
- Don’t use an address that expires automatically for important accounts.
After completing these checks, you can usually classify the issue as a mistyped address, delivery delay, resend replacement, domain policy, or unsuitable tool. Categorizing the problem is faster than clicking blindly and helps prevent using a short-term inbox for long-term account recovery.
Back to the inbox: try once more in order
Copy the new address, wait for the sending queue, and use only the latest code.