But… before filling in the field i don’t want to break something.
Should there something in this field and what should this be (and why is it empty ?_)
I think it’s a simple way to disable “rewrite subject” (which would for example add “[SPAM]” to the subject) without completely rewriting the config files. If you disable greylisting in the NS8 mail filter UI there’s a similar error message.
As everything is working the message can be ignored.
I was thinking that the setting you put in the NS8 UI will fill in this field in Rspamd, like the others.
No worries. It works, but an error message is always annoying