List cleaning works best as a decision process, not a single delete-invalid button. Preserve the result categories so your team can treat hard failures, risk, and uncertainty differently.

Prepare the source file

Keep one clear email column, remove obvious duplicate rows, and retain the source or campaign identifier you will need after export. A clean input makes the output easier to reconcile.

Choose a policy before upload

Use Standard when you need useful domain and trust context without mailbox checks for every row. Reserve Deepcheck for lists where mailbox status materially affects the send decision.

  • Reject structurally invalid and disposable addresses
  • Review role-based and catch-all addresses
  • Retry genuinely unknown outcomes instead of treating them as invalid

Export with context

Keep the result and relevant signal columns in the exported file. That makes the cleanup auditable and lets the campaign owner apply a stricter or looser risk policy without rerunning every address.

Put the framework into practice.

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