What’s the industry practice for bounce list retention?

Industry practice for bounce list retention varies but typically maintains hard bounce records permanently to prevent re adding invalid addresses from other sources. Soft bounce history should be retained for analysis and pattern detection.

Regulatory requirements may specify data retention limits. GDPR's data minimization principle suggests not retaining bounce data longer than necessary, though suppression lists serve ongoing legitimate purpose.

Balance retention needs against privacy requirements. Retain enough to prevent re mailing to bounced addresses and support analysis, but review whether detailed historical data beyond suppression status serves ongoing purpose.