Mail server
Using a proxy server for ssh connection

add a tracker to a specific torrent in rtorrent

If the url of your tracker changed, you can add the new url with the following command.

Go to the tracker information by pressing left and then 3 time down on the selected torrent. Then press Ctrl+X and enter:

d.tracker.insert="0","tracker_url"

You can then cycle trough the tracker list by pressing the space bar