For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chkpnt:mailserver/openSUSE_Tumbleweed/home:chkpnt:mailserver.repo
zypper refresh
zypper install clamav-unofficial-sigs
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chkpnt:mailserver/openSUSE_Slowroll/home:chkpnt:mailserver.repo
zypper refresh
zypper install clamav-unofficial-sigs
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chkpnt:mailserver/16.0/home:chkpnt:mailserver.repo
zypper refresh
zypper install clamav-unofficial-sigs
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:chkpnt:mailserver/15.6/home:chkpnt:mailserver.repo
zypper refresh
zypper install clamav-unofficial-sigs