NDR generated by recipient Exchange server complaining about Return DNS
Hi guys
We have a client that gets NDR mails when sending emails to the domain "recipient.com"
My client's domain is "client.com"
My Client setup:
Server 2003 Domain
Front end Back end Exchange 2003 Standard SP2
1 Linux Firewall/Router
The NDR contains:
Now I know this error is caused by the fact that we do not have a RDNS entry for the domain/exchange/firewall.
I would like to know where this RDNS entry must be made. The receiving exchange server tries to do a RDNS lookup on the FQDN of the primary exchange server, but this resolves to the Linux Firewall's external IP address.
Where must I make the change then?
I did not set up the environment so not 100% sure.
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