Three Steps to a Clean List

Subscribe if you verify on a regular rhythm: the plan tops you up every cycle and whatever you do not use rolls into the next one, so a quiet month is not wasted. Buy a pack instead if your work comes in bursts, because those credits are yours outright and never expire. You are on one or the other at a time, and while a subscription is running credit packs are unavailable.

The subscription keeps running until the period you have paid for ends, and the credits it granted stay spendable until then. When it ends, the rolled-over plan balance is removed. Credits you bought as a pack are untouched: plan credits are always spent first, so cancelling never takes something you paid for separately.

Each address is checked against the receiving mail server in real time rather than looked up in a cached list, so the answer reflects the mailbox as it exists right now. Where a server refuses to give a definitive answer, we return unknown instead of guessing a verdict.

No. Verification runs from our own sending infrastructure and never delivers a message to the address being checked, so nothing lands in the recipient's inbox and nothing is attributed to your domain.

Credits are held when the job starts and settled when it finishes, so you keep the ones you did not use. Rows that were never attempted, because you cancelled the job or it stopped early, are refunded. So are rows that finished as unknown: you are only charged for addresses that reached a real verdict.

The domain accepts mail for every address, so a successful SMTP handshake does not prove the mailbox exists. We label it honestly and attach a risk score rather than reporting it as valid, and you decide whether to keep it.

Yes. Create an API key in the dashboard and call the REST API at signup, on form submit, or from your CRM. Bulk jobs stream live progress over SSE so you can show a progress bar without polling.

Your list is processed to produce your results and nothing else. We do not sell it, do not use it to send marketing, and do not share it with other customers. It is handled by the service providers who run InboxValid, under contracts that require them to protect it. Jobs and their results are kept so you can reach your history, and can be deleted on request; the privacy policy has the detail.