Hello Michael,
I have had a look through the CA Support database and cannot find any reference to other customers using the postzmsg.
You can have a look at Sending Data to a Third-Party Application - CA Spectrum - 10.2 and 10.2.1 - CA Technologies Documentation , this describes how to integrate a 3rd Party software into Alarm Notifier.
If this is something that your company requires and cannot customize themselves, please contact CA Professional Services through your CA Sales Representative.
Kind regards,
Dencel