Maybe i should better explain the reasons behind this question:
We have some domains, where the mail-relay is mapped to several
IP-Adresses (and servers) over an DNS entry.
That is, we have ONE mailrelay that can be configured as relayhost.
So far, so good.
BUT, we also have systems without DNS - they rely on entries in /etc/hosts
I can map the mail-relays hostname only to one IP with /etc/hosts and
therefor, any redundancy is lost.
For such cases, it would be great if such a loadbalancing could be done
directly with multiple relayhost entries in main.cf
Any other idea?