Example PMTA config snippet for JSON stats:
He even named the alerts. “Slow Lane” for throttling. “Ghost Town” for idle queues. “The Gmail Wall” for 421 errors.
Use systemd or an external tool to ensure the pmta process is running. powermta monitoring
The frequency at which receiving ISPs tell PowerMTA to "try again later." This requires immediate adjustment of your max-smtp-out or max-msg-rate settings. System & Infrastructure Metrics
Alert the team if the 5xx permanent error rate exceeds 3% within a 5-minute window. Example PMTA config snippet for JSON stats: He
Modern PowerMTA versions expose a JSON REST API, enabling custom monitoring scripts.
If a malicious actor gains access to your system and sends spam, immediate alerts allow you to pause outbound traffic and patch the leak before ISPs blacklist your entire IP range. 2. Core Metrics Every Deliverability Engineer Must Track “The Gmail Wall” for 421 errors
Once your script can fetch and evaluate the data, the next step is to send alerts. Common methods include: