I think you could construct something like that by creating an action that
pipes into a shell script that calls kdialog (or a similar tool). Maybe
something like this:
#!/bin/sh
exec `kdialog --inputbox "Enter command to pipe into" ""`
Posted May 29, 2008 16:26 UTC (Thu) by corbet (editor, #1)
[Link]
Actually, Claws Mail has a way to accept a string which then gets piped into the canned command. So one could write a script which reads the string and interprets it as a command to be run with the file containing the email as input. Should work, I just need to mess with it some. But it should be easier...