eboxy has a web discussion forum here, for discussing anything eboxy-related.
If you find a bug or have a concrete feature request, please submit it through the issue tracking system. Notification emails are sent to the submitter and the maintainer each time a bug is added/updated, so it can be easier to track issues this way.
The eboxy mailing list is hosted at Sourceforge. It is fairly low traffic and mainly used for announcements, though support requests are welcome (you may prefer to use the forum, however).
If you'd prefer to contact the author (Paul Eggleton) directly in private, email email@example.com.