You beat me to recommending "alpine" (http://www.washington.edu/alpine/ http://www.washington.edu/alpine/). Alpine is super fast, you can use it just about und

You beat me to recommending "alpine" (http://www.washington.edu/alpine/ http://www.washington.edu/alpine/). Alpine is super fast, you can use it just about under any OS (as long as it has terminal window) and it understands SMTP and other protocols well enough that I've managed to use it in a lot of different situations from my basement DSL server.