Yahoo groups is going away: can I use Mathematica to download the old messages?

It looks like all the old email messages from my group are stored in web pages with URLs that look like this:

page="https://groups.yahoo.com/neo/groups/arco-75/conversation/messages/19291"] 

That’s email number 19291, and the others have the same form but different numbers at the end. What I am hoping to do is to grab all the old messages. The problem is that:

ans = Import[page] 

returns stuff that begins with “Sorry, an error occurred while loading the content.” From the look of it, I’m guess that the problem is that my Import statement is not “logged in” to the website, and so it is rejecting the request. Does anyone know how to “log in” to the yahoo site (to enable downloading of the old emails)?