claws-mail from openSUSE:Leap:42.3 project

Sty agraw n unessmres nnek/m

For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:42.3/standard/openSUSE:Leap:42.3.repo
zypper refresh
zypper install claws-mail