Sun Java System Messaging Server 6.3 Administration Guide

A.5.1.1 applTable Usage

Monitoring server status (applOperStatus) for each of the listed applications is key to monitoring each server.

If it’s been a long time since the MTA last inbound activity as indicated by applLastInboundActivity, then something may be broken preventing connections. If applOperStatus=2 (down), then the monitored service is down. If applOperStatus=1 (up), then the problem may be elsewhere.