smail(8) on Linux
The text dc251be5e251, as Debian 1.2 (Rex) shipped it.
mail delivery system
Flags it lists
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-C -
-D -
-F -
-I -
-N -
-bP -
-bR -
-bS -
-bc -
-bd -
-bi -
-bm -
-bp -
-bs -
-bt -
-bv -
-d -
-ee -
-em -
-ep -
-eq -
-ew -
-f -
-i -
-m -
-n -
-oC -
-oI -
-oU -
-odb -
-odf -
-oee -
-oem -
-oep -
-oeq -
-oew -
-oi -
-om -
-q -
-r -
-t -
-v