This seems really basic, but I haven't found a way to do it:
say you have an application/mac-binhex attachment sent to you. seems that if
you save the attachment, what you would want mutt to do is run hexbin on it &
save the output. but "save" in mutt in not a mime option, like print and view
are.
so you have to save the file, run hexbin by hand, etc.
or, perhaps the issue is binhex is really an "encoding" & you want mutt to
decode it (as it does base64, etc) before running the save,print,view commands.
the same might be true for gzip files, etc.
the alternative, I suppose, is to have a hexbin "viewer" that allows you
to save the file. seems lame, though, since then you have different "save"
commands for every encoding.
b.c.