xfce4-panel-plugin-mailwatch from openSUSE:11.4:Update project
Select Your Operating System
Add repository and install manually
For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:11.4:Update/standard/openSUSE:11.4:Update.repo zypper refresh zypper install xfce4-panel-plugin-mailwatch