yum install http://packages.nethserver.org/nethserver/7.5.1804/autobuild/x86_64/Packages/nethserver-mail-quarantine-2.3.0-1.12.pr83.g5a4f6f5.ns7.noarch.rpm --enablerepo=nethserver-testing
you will upgrade to 1.8.0
You must set a local email account and enable the quarantine, this email is not checked against spam. If you want to send all spam to external account, make sure this email will accept spam
config setprop rspamd QuarantineAccount user@domain.org QuarantineStatus enabled
you could also enable the email notification to postmaster (root alias) when emails are rejected
config setprop rspamd SpamNotificationStatus enabled
then expand and restart the service
signal-event nethserver-mail-quarantine-save
two templates are expanded, please check them, rspamd is restarted/reloaded
/etc/rspamd/local.d/settings.conf
/etc/rspamd/local.d/metadata_exporter.conf
you could review the email moved to quarantine by using a webmail, all notifications are sent to postmaster (root alias)