[pfx] Re: dual server configuration

Wietse Venema via Postfix-users:
> > The fault-tolerance of the bastion will be gone.  Right now, if the 
> > network to the premises fails or the on-premises node is unavailable, 
> > the bastion is the buffering queue.  If the bastion has to synchronously 
> > wait for an on-premise verdict/veto, the nature of the queue and its 
> > fault tolerance will change?
> 
> In my smtpd_proxy_filter proposal there is no queue on the bastion
> host.
> 
>     internet -> bastion (postscreen -> smtpd)
> 	-> hidden (smtpd -> cleanup -> queue...)
> 
> This also means no backscatter when the hidden smtpd rejects 
> some remote client command.

Perhap a simpler arrangement is to run HaProxy on the bastion host,
talking to a hidden MTA. For availability, run multiple hidden MTAs
on different hosts, with internal forwarding to collect mail in one
place.

	Wietse
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