Feature Request: Prometheus Metrics for Authenticated SMTP Activity per Mailbox

Summary

I have developed a prototype that exposes authenticated SMTP sending activity per mailbox as Prometheus metrics. Would this functionality be of interest for the official Mailcow Prometheus exporter?

Motivation

The goal is to improve visibility into authenticated SMTP activity and help administrators detect potentially compromised mail accounts. Metrics such as authenticated messages, external recipients, and successful deliveries per mailbox would make unusual outbound mail activity easier to identify and monitor with Prometheus and Grafana.

Additional context

No response