19 / Case example

Email list validation

Helps staff review email lists before use, separating valid, invalid, and uncertain addresses and recording the reason for each result.

Why it was needed

Teams working with uploaded address lists needed a better answer than a single unexplained valid-or-invalid score.

Data operations

What changed

The system standardizes and removes duplicates, checks addresses in controlled batches, stores the outcomes, and separates valid, invalid, and uncertain results for review and export.

Key requirements

Some mail systems accept every address, delay responses, throttle repeated checks, or deliberately reveal nothing. The system limits the checking rate and records why each address is classified as valid, invalid, or uncertain. These labels describe the checks performed, not a guarantee of inbox delivery.

Main features

  1. Upload address lists
  2. Check email-server responses in batches
  3. Present validation outcomes
  4. Back up and restore results
  5. Move data across database engines

Result

Replaced manual list checking with a repeatable, inspectable validation process.
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