Recently I have been reviewing rspamd logs and noticed that all incoming mails have the rspamd symbol MX_INVALID. I thought it might be a dns issue so I restarted unbound, this did not work. I restart rspamd but still the same. The last thing I tried was updating to the latest version using the update.sh script. After update I tested again but still the same MX_INVALID on incoming mails.
Does anyone know what is causing this and how I can go about solving, I appreciate any help, thanks.