Question 1

Is OTPBox free?

Accepted Answer

Yes. The web inbox is completely free, with no account, credit card, or sign-up required.

Question 2

Is there a paid version of OTPBox?

Accepted Answer

Two optional paid tiers exist. A developer API for automation (free tier, or $9/month for 5,000 requests) is documented at /docs. A consumer Premium tier removes ads and extends inbox retention, delivered as a single key you paste in — no account or password. Everything else stays free.

Question 3

Does OTPBox work with AI testing agents?

Accepted Answer

Yes — OTPBox ships an official MCP server so any MCP-compatible AI agent (including Claude) can create inboxes and test identities, wait for email, and extract OTPs and verification links directly as tools, without a custom integration.

Question 4

Do you support bulk or enterprise-scale testing?

Accepted Answer

Yes, for teams running large volumes of automated tests. Tell us about your use case and we'll follow up about bulk test-identity provisioning, higher concurrency limits, and dedicated infrastructure.

Question 5

How long does a temporary address last?

Accepted Answer

1 hour from the moment it's created. After that, the address stops working and its messages disappear from your view. For abuse prevention we keep a copy for 30 days, then permanently delete it.

Question 6

Is it safe to use OTPBox for one-time codes?

Accepted Answer

It's designed for exactly that: low-stakes sign-ups and verification codes. It should never be used for anything sensitive, such as banking or government accounts, since a deleted inbox cannot be recovered.

Question 7

Does OTPBox track me?

Accepted Answer

We use privacy-respecting analytics (Google Analytics and Microsoft Clarity) with IP addresses anonymized, no advertising, and no personalization, to see which pages are useful. This never touches your temporary address or messages.

Question 8

Can I reopen my inbox later?

Accepted Answer

Yes, on the same device and browser, until the 1-hour window expires, using a saved access token stored in your browser.

Question 9

Will OTPBox work on every website?

Accepted Answer

No. Some sites maintain blocklists of known disposable-email domains, including otpbox.io, and will reject sign-ups from it.

Question 10

Is it legal to use a temporary email address?

Accepted Answer

Yes, in the US, EU, UK and most other countries. The address itself isn't illegal — what you do with it can be. Using OTPBox to commit fraud, create fake accounts that break a site's rules, or evade age verification is against the law no matter which email address is behind it.

Question 11

Why do some websites block temp mail addresses?

Accepted Answer

Usually to stop fake sign-ups, prevent one person from claiming a free trial hundreds of times, or make sure they can actually reach a real person. That's a business decision each site makes on its own, and it's not something OTPBox can get around.

Question 12

Can I get banned for using a temp email address?

Accepted Answer

Possibly — but that's a terms-of-service question, not a legal one. A site is free to reject or ban sign-ups from a known disposable domain under its own rules.

Question 13

What should I never use a temp email for?

Accepted Answer

Anything tied to money, identity, or long-term access: banking, government portals, healthcare records, your internet or phone provider, airline or travel profiles, or an app-store account. If the address expires, so does your only way back in.

Question 14

Is OTPBox the same as a throwaway or burner email?

Accepted Answer

Yes. "Temp mail," "throwaway email," "burner email," and "10-minute mail" all describe the same idea: an address you use once and let expire. OTPBox's version lasts 1 hour, usually enough time for a code or confirmation link to arrive.

Question 15

Does OTPBox support attachments?

Accepted Answer

Yes. Attachments are scanned and unsafe file types are blocked; the rest can be downloaded straight from the message.