Valid
The available evidence supports delivery to the target under the selected profile.
Product
Verification, explained.
From the first character to the remote mail route, Riceveo keeps every signal separate, interpretable, and governed by policy.
Invalid
Syntax, domain, Null MX, or a permanent SMTP response rejects the target.
Risky
Catch-all, disposable, role, or other signals require a business decision.
Unknown
Timeouts, temporary failures, and blocked probes remain unknown instead of becoming false negatives.
Evidence dimensions
Useful detail without protocol noise.
Syntax failure
Malformed local parts, domains, and lengths stop before network work.
Domain and MX failure
Stable DNS reason codes distinguish missing domains, Null MX, timeout, and temporary resolver failure.
Provider signals
Disposable, catch-all, free-provider, and role-based findings remain visible warnings.
SMTP failure
Sanitized response categories preserve meaning without retaining raw transcripts indefinitely.