Fidamail
Technical questions
What our verdicts mean exactly — and what we cannot do.
What does each verdict mean?
Deliverable — the mailbox accepts mail. Undeliverable — it does not exist, or the domain receives nothing: a firm decision. Risky — the address may exist, but writing to it is a gamble: disposable domain, role address, domain that accepts everything, domain that allows no confirmation. Unverifiable — we got no answer at all; it is never a negative verdict.
Why do some addresses come back as “risky”?
A negative verdict from Fidamail is certain: if we say an address does not exist, it does not exist. But some domains — personal Microsoft, Yahoo, certain hosting setups — allow no mailbox-by-mailbox check: nobody can confirm there that an address exists. We return those as risky, never invented and never deleted on your behalf.
What is charged?
Every verdict we return is charged, whatever it says: you asked a question, we answered it. What we could not verify is not charged — when a check does not conclude we retry at our own expense, and if we still do not know, the credit goes back to you.
Do you write to the addresses we submit?
Never. No connection is opened to the mail server of an address you entrust to us, so no message can leave. An address never becomes a recipient because it was verified.
What happens to the list I upload?
It is encrypted while it is being processed, and the file you upload never touches our disk. Retention details, and how to have an address erased, are in our privacy policy.