smtp-sink(1) on Linux
The text 8440eb38a76a, as Debian 4.0 (Etch) shipped it.
multi-threaded SMTP/LMTP test server
Flags it lists
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-C -
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-L -
-P -
-a -
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-e -
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-n -
-p -
-q -
-r -
-s -
-v -
-w