Thanks for this trip down memory lane. I definitely remember discovering Z-mail on an SGI machine and being fascinated with the programming/extensibility of it

Thanks for this trip down memory lane. I definitely remember discovering Z-mail on an SGI machine and being fascinated with the programming/extensibility of it. Around the same time I also discovered mh and exmh (the Tcl/Tk interface), which also were very extensible. Eventually I ended up using mutt for the last countless years...