Para openSUSE Tumbleweed execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:Extras/openSUSE_Tumbleweed/server:Kolab:Extras.repo
zypper refresh
zypper install php-pear-Net_SMTP
Para 16.0 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:Extras/16.0/server:Kolab:Extras.repo
zypper refresh
zypper install php-pear-Net_SMTP
Para 15.6 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:Extras/15.6/server:Kolab:Extras.repo
zypper refresh
zypper install php-pear-Net_SMTP
Para 15.5 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:Extras/15.5/server:Kolab:Extras.repo
zypper refresh
zypper install php-pear-Net_SMTP
Para 15.4 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/server:Kolab:Extras/15.4/server:Kolab:Extras.repo
zypper refresh
zypper install php-pear-Net_SMTP