2026-05-05 · email verification · list hygiene · operations

Bulk email verification that operations teams can explain

Valid, invalid, catch-all, and unknown — what each status means for campaign policy, cost, and risk across an organization.

Verification only helps when humans across marketing, IT, and compliance share the same meaning.

Statuses without jargon

| Status | Organizational action | | --- | --- | | Valid | Safe to include for this check. | | Invalid | Do not send. | | Catch-all | Domain accepts almost any local-part — mailbox not confirmed. | | Unknown | Temporary issue — retry or handle under policy. | | Do not mail | Skip — trap or abuse risk. |

The pain of unclear results

When vendors return opaque scores, teams either ignore verification or argue about edge cases. Catch-all domains are a classic example: treating them as “valid” inflates risk; treating them as “invalid” may remove legitimate contacts without a documented rule.

The solution

Publish a short internal policy: which statuses may enter which campaigns, who may override, and how often sources are re-checked. Pair that with exports leadership can audit — and with the ability to remove source files after the job.

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