>I find this situation bizarre. I hacked together some code to do this --
>to allow me to edit incoming posts and post them to a list showing the
>original writer as the sender -- in a few hours. But LISTSERV, the
>product of *many* hours of coding, apparently lacks this capability.

What capability??? The ability to create mail messages with certain
header fields or to edit messages in certain ways or be allowed or not
allowed to spoof certain addresses is something for your mail program
to do or not do. LISTSERV has nothing to do with this.

  Eric