POP3 Application Processing Times
The POP3 Application Processing Time exceeds the critical value set in Expert Thresholds. The "Application Processing Time" measures the time spent waiting for the application or server, as opposed to network latency. Network Latency plus application processing time is referred to as Session Delay, which is tracked by a separate Expert Threshold.
Possible reasons for the event:
The slowdown is probably the result of a server or application configuration issue. Perhaps the server hardware is overloaded with messages. The POP3 mail server logs may be able to shed light on how the server is behaving during message transactions.