>>>>> In <73630.1137440939@juniper.net> Mark D. Baushke wrote:

> Note that the message 3:

>   Content-Type: application/pgp; x-action=sign; format=text

> is still not really being recognized as a signed message. I do not know
> if there is any way to get GNUS to help us with that problem or not.

Well, where is such a content-type defined?  I couldn't find it
out in the internet ("format=fixed" and "format=flowed" are
described in RFC2646 but "format=text" isn't).

Does "format=text" mean a message necessarily contains text that
can be displayed regardless of a type (which is "application/pgp"
in that case)? ...[1]
Or, does it hold good only in the case where a type is
"application/pgp"? ...[2]

If the answer for [1] is yes, we can do the following:

Add "application/pgp" to the variables `mm-automatic-display'
and `mm-inlined-types'.  For an experiment, you can do it as
follows:

(push "application/pgp" mm-automatic-display)
(push "application/pgp" mm-inlined-types)

And modify mm-uu.el.  Here's a patch, which can be applied to
both Gnus 5.10.6 and No Gnus: