xmh(1x) on Linux
The text 4a0f0a5027bc, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.
send and read mail with an X interface to MH
Flags it lists
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-flag -
-initial -
-path