http://www.cam.ac.uk/cs/newsletter/1992/nl165.html
“the Central mail switch is now in service, and is processing nearly 2,000 messages per day”
It’s now about 450,000.
http://www.cam.ac.uk/cs/newsletter/1995/nl181.html
Hermes is running very smoothly after the conversion [from PP] to Smail and the reduction in the maintenance workload is staggering.
Tony Finch – blog