On Mon, 2012-12-10 at 09:18 -0700, The Doctor wrote: > You can use tnef to extract winmail.dat and then replace the contents accordingly.
Oh, right, you're talking about an *application* called "tnef".
And that means, I presume, that you're wanting to know how to modify the
message body in transit. I'm sure others can offer some guidance, but in
the words of the Dragons - that's not something I would recommend doing,
so I'm out.