You should be discussing this on the mailing lists for the DKIM package you're
using.
In the case of dkim-milter, that would be
dkim-milter-discuss(_at_)lists(_dot_)sourceforge(_dot_)net(_dot_)
(Note: You should be using dkim-milter, not dk-milter.)
But yes, the dkim-filter binary has a test signing mode. Check the man page
that comes with it for details.
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