How do ESPs enforce bounce thresholds?
ESPs enforce bounce thresholds to protect their infrastructure:
Enforcement mechanisms:
Automated warnings: Email alerts when rates spike. Account flags: Internal monitoring increased. Sending restrictions: Volume or rate limits applied. Manual review: Human evaluation required. Suspension: Sending blocked entirely.
Typical enforcement tiers:
2% hard bounces: Warning notification. 5% hard bounces: Account flagged for review. 10% hard bounces: Sending suspended pending explanation.
Remediation requirements:
Explain bounce spike. Provide list hygiene plan. May require list cleaning. Demonstrate improved practices.
Why ESPs care:
Shared IP reputation affects all customers. Poor senders damage ESP relationships with ISPs. Compliance requirements for ESP industry.
ESPs are gatekeepers protecting their harbor. Abusers threaten everyone's access.
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