What is alert 8199?
A remote client has attempted to connect to GMS but the client from this IP address was previously disconnected because they may have been attempting to gain access incorrectly. GMS has dropped the connection to release the resources so other clients can access the service.
In this case, session Undefined from IP address Undefined was rejected.
If you need to allow this user access to the server, you will need to stop and restart the POP3 service, or wait for the dynamic IP list to expire.
Keywords:rejected bad password access denied busy deny POP3 8199