This interface is very widely used. It has been compiled on all major platforms (DEC, SUN, IBM, SGI, HP) and is even bundled with the HP workstations.
Some of the Science Institute servers, namely ned1.sims and gh1.hia, use elm as their default mailer. All other Science institute servers have elm available on-line.
If the command
returns a full screen interface, then elm is being used.
The
elmcommand may also be used.