@devs I can only add extensions for blocking emailattachements from rspamd using the old interface. Not working with cockpit interface. Is this a known issue? I thought, I should report. - Tested today after updating system, and its still present.
Steps to reproduce: Going to email/filter/advanced/extension and add an extension and try to safe -> Error on following command: nethserver-mail/filter/update.
And thanks Andy for giving me the idea to test if it works from old server manager, which it does.