smtp-sink(1) on Linux
The text 486ffca2d7a3, as Debian 3.1 (Sarge) shipped it.
multi-threaded SMTP/LMTP test server
Flags it lists
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-8 -
-C -
-F -
-L -
-P -
-a -
-c -
-e -
-f -
-h -
-n -
-p -
-q -
-r -
-s -
-v -
-w