: Sudden increases in "Inbound" traffic on an outbound-only server. Auth Failures : Alerts for potential relay hijacking or credential leaks. ISP Throttling
Watch the staging queue. If it stays above 5,000 for more than 3 minutes, your IO or DNS resolution is bottlenecked. powermta monitoring better
Better monitoring requires looking at both ends of the pipe. : Sudden increases in "Inbound" traffic on an
Monitoring DMARC reporting ensures your outbound mail remains trusted by ISPs. 4. Advanced: Predictive Alerts & Visualization 000 for more than 3 minutes
tail -f /var/log/pmta/pmta.log | grep error