mime-tool(1) on Linux
The text a7ff2faa6f6d, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
a simple program to construct MIME messages with attached files
Flags it lists
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-0 -
-7 -
-8 -
-D -
-N -
-V -
-a -
-b -
-c -
-d -
-i -
-m -
-n -
-o -
-p -
-q -
-s -
-t -
-u -
-v -
-x