What is “bounce recycling” (and why it’s dangerous)?

Bounce recycling is re-adding suppressed addresses:

How it happens:

Bounced addresses suppressed. List imported from old source. Bounced addresses re-introduced. System sends to them again.

Why it is dangerous:

Reputation damage: ISPs see you sending to known-bad addresses. Spamtrap risk: Old addresses may have become traps. Wasted resources: Bounces will happen again. ESP consequences: May trigger account review.

Common recycling sources:

Re-importing old customer lists. CRM sync without suppression check. Database restore without suppression merge. Manual list addition bypassing checks.

Prevention:

Always check against suppression before sending. Maintain master suppression across all systems. Audit list imports carefully. Never override suppression casually.

Bounce recycling is inviting known problems back. Once suppressed, an address should stay suppressed.