[pfx] Re: dual server configuration

On 2026-07-18 10:52, Wietse Venema via Postfix-users wrote:
> Wietse Venema via Postfix-users:
>> 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.

I understand better now, and I understand the use of the word "hidden." 
While "bastion" describes well the cloud node, "hidden" is not 
semantically precise.  I have not made up my mind yet, but it is 
possible that the on-premises node will *send* emails.  Proxy is not 
what I am looking for, but thank you for making me attentive to this 
possible configuration.

Yuv


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