Evidence supports use.
The observed technical signals satisfy the active Clean policy without material unresolved risk.
Inspect evidence before acting.Read the verdict and the reason behind it.
Clean separates observed evidence, confidence, policy and recommended action so a technical signal never masquerades as certainty.
FOUR DECISION STATES
A compact vocabulary for operational action.
The decision state is an action-oriented summary. It does not erase the evidence or uncertainty underneath it.
Human judgment is useful.
Signals are mixed, contextual, or policy-sensitive enough that an operator should inspect the evidence.
Do not silently upgrade to safe.Evidence supports exclusion.
The active policy finds enough technical risk to recommend keeping the address out of the intended workflow.
Policy remains explicit.The evidence is not decisive.
Clean preserves uncertainty when the available signals cannot support a stronger claim.
Unknown stays unknown.DECISION ANATOMY
Five layers make the answer explainable.
A durable verification is more than a status word. Clean keeps observation and policy separate so teams can understand how a decision was formed.
- 01Normalized inputThe address Clean actually evaluated.
- 02EvidenceSyntax, routing, risk and bounded mailbox observations when available.
- 03ConfidenceHow strongly the evidence supports the interpretation.
- 04Policy resultHow the active policy maps evidence to an operational state.
- 05Immutable receiptA durable record of what Clean decided and why.
EVIDENCE FAMILIES
Signals stay visible instead of collapsing into a black box.
Address structure, Unicode handling and normalized evaluation input.
Domain state, MX routing, null-MX handling and implicit routing evidence.
Disposable, role-address, free-provider and typo-related signals.
Bounded SMTP RCPT evidence when authenticated verification is allowed to perform it.
The explicit rules that convert observations into safe, review, suppress or unresolved.
Receipt and audit context for later explanation and system accountability.