Has anyone else run into concern about keeping list archives essentially forever? We would like to have an automatic pruning facility for list archives, under the control of the list owner. The primary justification for such a facility is not to save disk space, but rather that archived email may be subject to subpeona in lawsuits and other types of legally required disclosure. Even if there's nothing embarassing in the archives, the effort to search the archives of lots of lists could be significant. So the list owner should be able to easily specify how long archives are to be retained. Some nice things to be able to specify would be what to do with the old archives (e.g., email to list owner) and also maybe a warning in advance that archives are going to be deleted.