Haeaderadd and the message archive

Hi All,

I was playing around with of using headeradd to an X- header to
message that I intended to levarage for building the HTML archive of
my list.  I discovered that the headers from headeradd do not get
added to the archived version of the message.  One additional side
effect of this behavior is that the headers from headeradd are not
present in a message retrieved with

  <listname>-get-<msgNum>@host.com

Is there a reason why the headers from headeradd should not (must
not?) be inserted into the message before the message is put in the
archive?

Sincerely,

Curious in San Francisco