Monitoring: Powermta

Soft bounces indicating temporary issues, such as full mailboxes or local rate limits.

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

| Metric | Warning Threshold | Critical Threshold | |--------|------------------|--------------------| | Queue size (total) | >100k messages | >500k messages | | Hard bounce rate (per domain) | >5% | >10% | | Deferral rate (4xx) | >15% for 10 min | >30% for 30 min | | Disk usage (spool) | >75% | >90% | | PMTA process down | N/A | Immediate | | Complaint rate | >0.2% | >0.5% | Soft bounces indicating temporary issues, such as full

Notifies engineers about failing connection queues before they cause total delivery failure. Core PowerMTA Metrics to Track Core PowerMTA Metrics to Track PowerMTA provides several

PowerMTA provides several native ways to extract performance data. Most enterprise setups use a combination of these: 1. The Web Monitor

Set up rule-based notifications to ping your team if delivery rates dip below a set threshold. 2. The ELK Stack (Elasticsearch, Logstash, Kibana)