smtp-source(1) on Linux
The text 2d53ed71eb7e, as Debian 5.0 (Lenny) shipped it.
multi-threaded SMTP/LMTP test generator
Flags it lists
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-4 -
-6 -
-A -
-C -
-F -
-L -
-M -
-N -
-R -
-S -
-c -
-d -
-f -
-l -
-m -
-o -
-r -
-s -
-t -
-v -
-w