mailinspect(1) on Linux
The text e9d297cf87fb, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it. The page shows this text now.
sort an mbox by category and pipe emails to a command.
Flags it lists
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-G -
-I -
-V -
-c -
-g -
-i -
-j -
-o -
-p -
-s -
-z