> Perhaps this is easy, but I didn't see how in the documentation. I'd
> like to replace all of the subscribers on a list without having to do
> a GET first to get the header. The web interface bulk facilities can
> do it, but can email?

Yes

QUIET ADD LISTNAME DD=X IMPORT PW=XXXXXXXX
//X DD *
[log in to unmask] first last
[log in to unmask] first last
[log in to unmask] first last
/*

You can replace first last with just  * if you want.