debian 11: amavis permissions

On amavis systems need to:

chgrp amavis /etc/amavis/conf.d/
chmod 750 /etc/amavis/conf.d/
chmod 644 /etc/amavis/conf.d/50-user

https://www.howtoforge.com/community/threads/bullseye-for-ispconfig.87450/page-2#post-427053

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information