router(8) on Linux
The text 1eefc929bcb8, as Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.
zmailer message routing daemon
Flags it lists
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-L -
-N -
-P -
-S -
-V -
-d -
-f -
-i -
-k -
-m -
-n -
-o -
-s -
-t