How do suppression lists protect against deliverability loss?

Suppression lists protect reputation through prevention:

What they do:

Block sends to previously bounced addresses. Prevent repeated invalid attempts. Demonstrate responsible list management.

Protection mechanisms:

Avoid repeat bounces: Each prevented bounce is reputation saved. Signal to ISPs: Shows you process feedback. Spamtrap avoidance: Old bounced addresses may become traps.

Types of suppression:

Hard bounce list: Permanent exclusion. Soft bounce tracking: Threshold-based exclusion. Complaint list: FBL-driven exclusion. Manual suppression: User-requested exclusion.

Implementation:

Check suppression before every send. Update in real-time as bounces occur. Maintain across campaigns and segments. Never override without good reason.

Suppression lists are your immune system. They prevent reinfection from known-bad addresses.