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Data hygiene
How to clean a purchased lead list safely
DR
Purchased and aggregated lists are a fast way to fill the pipeline — and a fast way to wreck your sender reputation if you send to them raw. Here's how to clean one before it touches your domain.
Assume it's dirty
Purchased lists routinely contain a high share of invalid addresses, spam traps, duplicates and wrong numbers. Sending to them unverified is one of the quickest ways to get flagged.
Clean it in three steps
- Verify every email and drop invalids, disposables and obvious spam-trap patterns.
- Validate phone numbers so reps don't dial dead lines.
- Deduplicate against itself and your existing CRM.
Then warm up slowly
Even a clean purchased list should be eased into — send to your most likely-valid segments first and ramp volume gradually. Verifying up front is what makes that safe instead of reckless.
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