# `unverified`: the mailbox could not be confirmed

The handshake ran and did not settle the mailbox — greylisting, a timeout, an unreachable server, a partner outage — so smtp_checked is false and the verdict is risky.

- Weight: +10
- Dataset: mailbox-smtp
- Read from: `smtp_checked`
- Verdict reasons it comes with: `unverified`

The answer degrades honestly rather than reading a non-answer as a yes; mailbox_confidence estimates the mailbox from the domain's posture and the username's shape. An unverified answer whose smtp_reason is provider_unavailable is free; one whose handshake reached the server bills like any risky answer.

It reads from smtp_checked and comes with the unverified verdict reason, the last in precedence.

**What to do.** Pass callback_url to have the address re-checked after 5 and 20 minutes and the settled verdict pushed to you; repeats inside seven days are free.

```json
{
    "email": "mia@acme.com",
    "deliverable": "risky",
    "reason": "unverified",
    "smtp_checked": false,
    "smtp_reason": "greylisted",
    "mailbox_confidence": 65,
    "risk_signals": [
        {
            "signal": "unverified",
            "weight": 10,
            "dataset": "mailbox-smtp"
        }
    ]
}
```

Reference: https://spaw.co/docs/signals/unverified