Wietse Venema via Postfix-users:
> sandeep pawar via Postfix-users:
> > Some of the Java mail client libraries don't support MX record and don't
> > have a good retry mechanism and therefore want to run a group of relay
> > behind load-balancer so that when relays are patched, no mails are lost by
> > ensuring a right health check.
> >
> > These relays are authenticated and also have policy service configured
> > which also take decisions based on client IP.
> >
> > Want to understand how I can preserve client IP in Postfix and use it
> > further in logging and policy service if possible. Found some reference
> > around sendproxy protocol.
>
> The picture is
>
> Java clients -> Postfix relays with policy service -> other SMTP servers ->
> internet
>
> and you want to know the Java client IP address in the other SMTP
> servers? Postfix SMTP servers and clients implement the XFORWARD
> protocol for doing that, but it requires that the other servers
> support that protocol.
Unfortunately, there is an omission in the code: When XFORWARD support
was added, I forgot to add it to the check_policy_service policy
delegation feature.
Wietse
> > Open to any other suggestion to make relays highly available for client and
> > save against edge case with small downtime.
>
> Wietse
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