Indeed, using gconf-editor may allow to set some default app. (but that's obviously a workaround, since a regular user should be able to rely on something more straightforward, i.e. a working gnome-default- applications-properties). But even with gconf-editor, you can't select a mailer, since there's no specific option (key) available for this... See screenshot attached.
** Attachment added: "Capture.png" https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/708382/+attachment/1968855/+files/Capture.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/708382 Title: cannot create "custom" preferred applications -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs