postfix-bdb from home:computersalat:devel:mail project
Select Your Operating System
Add repository and install manually
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:computersalat:devel:mail/15.5/home:computersalat:devel:mail.repo zypper refresh zypper install postfix-bdb