| === MetricsMailet | |
| This Metrics mailet increments a counter on every incoming emails. | |
| This counter is accessible via JMX, or grafana. Read xref:operate/metrics.adoc[more about metrics]. | |
| Example : | |
| .... | |
| <mailet match="all" class="MetricsMailet"> | |
| <metricName>relayDenied</metricName> | |
| </mailet> | |
| .... | |
| Will increment a counter relayDenied |