Hello,
I'm running Kolab16 on Debian 11, and php-net-sieve is also available from Debian:
# apt policy php-net-sieve
php-net-sieve:
Installiert: 1.4.4-0~kolab2
Installationskandidat: 1.4.4-0~kolab2
Versionstabelle:
1.4.4-2 500
500 http://mirror.netcologne.de/debian bullseye/main amd64 Packages
*** 1.4.4-0~kolab2 510
510 https://mirror.apheleia-it.ch/repos/Kolab:/16/Debian_11.0 ./ Packages
100 /var/lib/dpkg/statusI looked at the kolab source and I don't see kolab specific changes in the diff.
My guess is that we should be able to drop the kolab package.