post...@ptld.com:
> > On 05-19-2021 6:38 pm, Wietse Venema wrote:
> > This is too complicated.
> >
> > With a load balancer, the backend hosts don't need to exist in DNS,
> > and the backend hosts don't even need a globally unique IP address.
> > They can sit on 10.0.0.1 and 10.0.0.2 and have fake hostnames.
>
> But they do need public IP, they are submission servers. After they
No they don't. They need a shared external IP address (as in NAT).
> accept an email from a client they are going to try to deliver it. They
> need a proper hostname matching elho and PTR records. Granted they wont
No they don't. Just like they need a shared public IP address to
RECEIVE mail, they can use a shared IP address to SEND mail.
But they will have to "speak" using the public DNS name.
Wietse
