cyrus-imapd from home:wekabe:cyrus-3.8 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:wekabe:cyrus-3.8/15.5/home:wekabe:cyrus-3.8.repo zypper refresh zypper install cyrus-imapd