As a GRML .zshrc user I also wanted to try it on an IBM AIX system, but 
unfortunately, it doesn't work. When I login to the system via SSH, the connection 
is closed again right away. After renaming .zshrc to something zsh doesn't open, I 
can connect to the system w/o problem.

I am aware that AIX may not be your primary target, so I declared this a wish :) 
However, I've attached a log of a failed login attempt after adding "set -e" to 
.zshrc, just in case...