You could write a CL program to monitor the QSYSOPR queue for unanswered messages, whcih then sends you an e-mail.
In Ops Navigator there’s also an option to monitor for messages and run a command. Right click on your system name, select monitors, then message.
I agree with Martin. I have been using Management Central Message Monitoring to monitor for specific messages on 2 i5 servers and then send emails to both my work and home email accounts.
Hope this helps,