Multiple domain addresses in RDNS records

[digiweb]

"Reject Unknown Clients" & "Reject Unknown Senders" features are active in System Settings.

There is a sender and the system rejects the mails from this sender.

The log records and the results I got with the dig command on the server are attached. How can I fix this.

 

[mira]

The issue is that smtp2.starrafineri.com.tr doesn't publish a DNS record. This means going from IP to Name works, but the other way around doesn't.

The checks in this case are in both directions.