As noted in the previous post, a free Juno account grants you access to juno.com, including their webmail.
Juno requires that even people that subscribe to their service use their software to connect to the Internet.
Unfortunately, their software isn’t available for Linux.
An excellent alternative is http://dialup4less.com. The rates are fair, the service is great, and the connection is fast. They have access numbers in most states, if not all.