mailtoe(1) on Linux
The text 837c2e4ccbdb, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it. The page shows this text now.
a train-on-error simulator for use with dbacl.