A disposable email check tells you whether an address uses a throwaway / temporary domain — like mailinator.com or 10minutemail — that self-destructs after minutes. Blocking these at signup keeps fake accounts, trial abuse, and dead subscribers off your list. Enter a domain above to check it.

What is a disposable email address?

Disposable (or temporary) email addresses are free, no-signup inboxes that expire automatically. People use them to get past signups, claim free trials repeatedly, or avoid giving a real address — which fills your list with addresses that will never open, click, or convert.

Why block them at signup?

Throwaway addresses create fake accounts, enable repeat free-trial abuse, and inflate subscriber counts with contacts that immediately go stale — which drags down open rates and sender reputation. Checking the domain at signup blocks them before they enter your list.

FAQ

How do I detect disposable email addresses?

Enter the domain in the check above; it matches against a continuously-updated list of throwaway domains. There is also a keyless API: GET https://api.tinysend.com/v1/tools/disposable?domain=mailinator.com — call it at signup to block fakes in real time, no signup or key.

Why should I block disposable emails on signup?

They create fake accounts, enable repeated free-trial abuse, and never convert, which hurts both your metrics and your deliverability as those addresses go dead.

Can I check disposable emails via API in my signup flow?

Yes. GET https://api.tinysend.com/v1/tools/disposable?domain= returns a verdict with no signup or key, so you can reject throwaway domains inline, or call the check_disposable MCP tool from an agent.