>How can I avoid the appearance of some of the following mail headers
>(Sender, Content-Type) when the messages are viewed through the web archive
>interface.

You can do this by adding a parameter to the "A2" URL with a list of the fields
you want to suppress, in upper case:

http://.../wa.exe?A2...&S=CONTENT-TYPE+SENDER

Likewise, you can add this parameter to the "A1" URL (show list of messages)
and it will be propagated to A2. To make it the default, edit the A1-DEF web
template using the template editor and add:

+SE S CONTENT-TYPE SENDER

  Eric