Some of you might remember relays.ordb.org going offline a couple of years ago. It was one of the widely used, free, DNS Blacklists.
Yesterday at some point they started them backup and they appear to have blacklisted every single IP address.
Our monitoring system checks all configured IPs on all nodes against blacklists of this kind and sends you a notification via email or sms if one of your IPs gets on a list.
Please ignore these, but check all your mail servers to make sure they are not blocking based on "relays.ordb.org".
Yesterday at some point they started them backup and they appear to have blacklisted every single IP address.
Our monitoring system checks all configured IPs on all nodes against blacklists of this kind and sends you a notification via email or sms if one of your IPs gets on a list.
Please ignore these, but check all your mail servers to make sure they are not blocking based on "relays.ordb.org".