On 9/2/2013 2:40 PM, R. David Murray
I don't think the text/plain part can refer to the related parts,
but, like you, am willing to be educated if there is a way; but
while the text/html may be able to if things like cid: URIs can
reach up a level in a given MUA, the text/plain would be left with
the additional parts being attachments, methinks. This is less
interesting than the technique Apple Mail uses, but more interesting
than not even seeing the attached pictures.
I'm still not understanding how the text/plain part *refers* to the
MUAs tend to be able to display what they produce themselves, but I
have situations where they don't handle what other MUAs produce.
One nice thing about this email6 toolkit might be the ability to
produce, more easily than before, a variety of MIME combinations to
exercise and test a variety of MUAs. While perhaps most of them have
been tested with some obviously standard MIME combinations, I
suspect most of them will produce strange results with combinations
that are out of the ordinary.