I tried it now. Looks really nice, I have to learn about the features…
I put the RPM on my webhost so others can try or do you have it online somewhere? If it’s ok for you?
curl https://rspamd.com/rpm-stable/centos-7/rspamd.repo > /etc/yum.repos.d/rspamd.repo
rpm --import https://rspamd.com/rpm-stable/gpg.key
yum install http://markusneuberger.at/download/nethserver-rspamd-0.1.0-1.ns7.noarch.rpm