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A spike in hard bounces indicates list hygiene issues; a spike in soft bounces often suggests ISP throttling.

Don't wait to check a dashboard. Use SNMP or custom scripts to trigger Slack or Email notifications when a specific IP gets a "554 Blocked" response. powermta monitoring

Slow handshakes can indicate network latency or DNS issues. C. System Health A spike in hard bounces indicates list hygiene

To get a full picture of your mail server's health, focus on these three categories: A. Deliverability Metrics powermta monitoring

A massive, stagnant queue can slow down the entire system. Monitor "stale" messages and purge them if necessary. Conclusion

If your "Retry" queue is growing, ISPs are likely pushing back on your volume or speed.