FYI, exmh displays the signed message nicely (after being told through
a menu option to display the parts individually).
mh 6.8.3, whose MIME conformance is rather suspect in the area of
unknown multiparts, can be made to behave reasonably by using the profile
entry:
mhn-show-multipart: less %F
This starts the viewer program with *both* contents, all headers stripped,
on the command line. (is this a fug or a beature....?)
I think it is critical that a signing service be possible to ignore, so
as to not impact non-secured mailers; this seems to be a good first attempt.
Harald A