hoststat(8) on Linux
The text b48b8336f24f, as Debian 2.0 (Hamm) shipped it.
an electronic mail transport agent
Flags it lists
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-B -
-C -
-F -
-N -
-O -
-R -
-U -
-V -
-X -
-bD -
-bH -
-ba -
-bd -
-bh -
-bi -
-bm -
-bp -
-bs -
-bt -
-bv -
-d -
-f -
-h -
-i -
-n -
-p -
-q -
-qI -
-qR -
-qS -
-r -
-t -
-v