Snov.io Email Verifier: How Often Should You Clean Lists and What Bounce/Block Thresholds Are Acceptable?
We used to verify only before big pushes and wondered why reputation drifted between campaigns. The fix was cadence, not heroics: light verification weekly for active sequences, full verification before any new source is added, and a quarterly deep clean of the entire database. Thresholds matter: we keep total hard bounces under 2% per sender pool and flag any segment that trends above 1% for two weeks in a row. A small team can’t outwrite spam filters; you have to out-discipline them. Verification is hygiene, not a miracle.
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