Here's some rough statistics as promised -- essentially I am seeing
that MIME type correctness for images varies a lot across different
mailing lists. For example:
One list archive with about 6000 image attachments has:
51 application/octet-stream
1134 image/pjpeg
4866 image/jpeg
18 image/jpg
Another list archive with about 100 image attachments has:
75 application/octet-stream
0 image/pjpeg
15 image/jpeg
0 image/jpg
As you can see, some lists are better than others in terms
of proper Content-Type labeling. Interestingly, I didn't see
much weirdness beyone application/octet-stream -- maybe I just
didn't look hard enough.
Jeff
