From: Michael Ionescu (mhiionescu.de)
Date: Thu May 02 2013 - 16:14:23 CDT

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On 02.05.2013 17:57, Noel Jones wrote:
>> [...]
>> prequeue proxy virusfilter [...] precludes
>> rewriting the Received: header [...]
>> QUESTION 1: Is this correct?
>> [...]
>> QUESTION 2: Is there a definitive overview of all the ways postfix
>> detects loops and at what stages these are employed? (I mean aside from
>> the source code.) :-)
>> [...]
>> QUESTION 3: Can one make sender-based-routing conditional [...]?
>> QUESTION 4: Does this also work with an smtpd configured with a
>> pre-queue proxy filter?
>> [...]
>> Thanks for your insight!
>> Michael
>>
>
>
> "C" Multiple postfix instances is the preferred solution. Postfix
> supports multiple instances on the same machine quite well. The
> added overhead to the machine is negligible. There is some extra
> administration, but the upside is you can easily do things that are
> not possible (or really ugly) in a single instance.
>
> http://www.postfix.org/MULTI_INSTANCE_README.html
>
>
> -- Noel Jones
>

Thanks Noel. While this may be generally correct, I come from using
qmail and having to compensate its shortcomings by both extensive
patching and ultimately placing multiple installations on each machine.

I do not want to go back to having multiple MTA installations on a
machine because of the drawbacks in administration, even in view of
postmulti. Therefore I am explicitly asking about the other solutions I
have in mind and am open for ones that I have not thought of.

Michael

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