I need to pipe all mail delivered to a particular user into an external script. Mail will be exiting ZCS. In previous systems I've been able to simple create an alias with the | /path/to/script and called it a day. I tried setting up a forward to the pipe statement and ZCS complains.

Is there any workaround for this? I'd like to remain "upgrade-compliant" and not change any of the system that I dont need to.