How do bounce spikes signal list quality issues?
Bounce spikes are diagnostic signals:
What spikes indicate:
Something changed in your list or sending. New addresses from untrusted source. Old segment being reactivated. List import without validation.
Common spike triggers:
New acquisition source: Purchased or scraped list. Dormant segment send: Old addresses gone bad. Database migration: Corrupted or outdated data. Suppression failure: Previously bounced addresses re-added.
Investigation approach:
Isolate which segment spiked. Identify data source. Check age of addresses. Review recent list changes.
Response:
Pause sending to problematic segment. Clean before resuming. Improve validation at source. Audit suppression processes.
Bounce spikes are the alarm bell. Something went wrong; investigate immediately.
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