James P. Salsman wrote:
> [...] suppose I sent you a
> picture as an attachment to an email. Would you like to know
> whether it was attached from my camera or scanner (or filesystem)?
The human reading the email _might_ want to know, in which case the
body of the message is the right place to put that information - not
a header that they don't (and shouldn't) see.
The Content-Disposition header should not be about where the body
part _came_from_ - it is about where it should _go_to_ (its
Disposition, not its Source).
If you think that there is a reason to tell the MUA about the source
(personally, I don't see what I would do with such a thing), then
argue for a new header that does that (and get mired in the
security/trust issues already cited elsewhere), but don't try to
change the usage of Disposition.
