The Breakdown tab and the Breakdown export use these categories. If an address matches more than one — say, a role address on a disposable domain — the most important one wins: spam trap, then disposable, then role, then the mailbox answer.
| Category | What it means | Group | Charged |
|---|
| Valid | The mail server confirmed the mailbox exists. | Safe to send | Yes |
| Valid (MS365) | A Microsoft 365 / Outlook address confirmed by Microsoft’s own directory rather than by the mail server. Written valid in every export. A very small share may be accounts without an active mailbox. | Safe to send | Yes |
| Category | What it means | Group | Charged |
|---|
| Catch-All | The domain accepts mail for every address, so this mailbox can’t be confirmed either way. Each one gets a likely / uncertain / risky rating — see Catch-all addresses. | Risky | Yes |
| Role | A shared inbox such as info@, sales@ or support@. It may exist, but shared inboxes rarely reply to cold email and some are watched closely. | Risky | Yes |
| Inbox Full | The mailbox exists but is over its storage limit, so mail would bounce for now. Often a sign of an abandoned inbox. | Risky | Yes |
| Category | What it means | Group | Charged |
|---|
| Invalid | The mail server said the mailbox does not exist, or the address isn’t valid email syntax (syntax errors are free). | Invalid | Yes |
| Disabled | The account exists but is disabled or suspended. | Invalid | Yes |
| No Mail Server | The domain has no mail server at all — no MX record, or one that explicitly says “this domain takes no mail”. A verdict about the whole domain. | Invalid | Yes |
| Spam Trap | An address that looks like a known or likely spam trap. Never mailed, never checked. | Invalid | Yes |
| Disposable | A throwaway inbox from a temporary-email provider. | Invalid | Yes |
| Category | What it means | Group | Charged |
|---|
| Unknown | We asked, but couldn’t get a definite answer. Why this happens → | Risky | Refunded |
| Not Verified | We never got to check this address. That’s a gap on our side, not a verdict. Re-run the list to get an answer. | Risky | Refunded |
| Still Resolving | The job is still checking whether the domain is catch-all. These turn into Valid or Catch-All before the job finishes. | Risky | Refunded if still there at the end |
Every row also carries a short reason in the export, for example:
| Reason | Usually means |
|---|
| Mailbox confirmed | Valid |
| Mailbox does not exist | Invalid |
| Domain accepts all addresses | Catch-All |
| Mailbox confirmed at the mail platform behind the gateway | Valid — confirmed past a security gateway |
| Server accepted but could not be confirmed | Unknown — see Why some results are unknown |
| Mailbox full | Inbox Full |
| Account disabled or suspended | Disabled |
| Role-based address | Role |
| Administrative role address | Unknown — abuse@, postmaster@ and similar are never checked |
| Disposable email provider | Disposable |
| Known spam trap / Possible spam trap | Spam Trap |
| Domain has no mail server / Domain does not accept email | No Mail Server |
| Domain is parked | Unknown — the domain is parked with a domain seller |
| Server temporarily unavailable / Server response inconclusive | Unknown |
| Mailbox could not be confirmed | Unknown — Microsoft 365 had no record, which is not proof the mailbox is missing |
| Invalid email format | Invalid (free) |
