I have set up an A record for a subdomain for an app served via NGINX. Through that app, I need to be able to send emails. So, for that purpose, I had my hosting service to set me up an rDNS.
What happens now is that if I try to activate the DNS proxying in that subdomain A record, SpamAssassin throws me a RDNS_NONE error. Which is fair enough.
My question is how I could possibly have DNS proxying on that subdomain (I don’t think i can, for instance, have the Authenticated Origin Pulls working without it) but keeing the rDNS working alright?