When you think you found a bug and want to inform Jamendo about it, please try to be as detailed and informative as possible. For example try to include the answers to these questions:
Where does it happen? What does happen? What should happen? What are you using? (If it applies. Operating System, any related Software like a browser, a Bittorrent client etc.)
Example:
Where does it happen? In friend invitation e-mails What does happen? Links to usernames with spaces do not work, they are split at the first space. Example: http://www.jamendo.com/en/user/The Chilling Spirit What should happen? Spaces should be urlencoded with %20, for example http://www.jamendo.com/en/user/The%20Chilling%20Spirit What are you using? Does not matter.
Of course you do not have to be as verbose or already knowing an solution. But please be more specific than (for example): "I got a mail with a friend invitation and the link does not work".