Richard,

On 02/19/2013 12:34 PM, richard lucassen wrote:
> I have transport front-end servers for domains:
> 
> domain1.tld
> domain2.tld
> domain3.tld
> domain4.tld
> [..]
> domainX.tld
> 
> I want to blacklist 1.2.3.4/24 only for destination domain3.tld (and
> reply with a 5xx if possible).
> 
> What's the best way to handle this? On the backend server somewhere?
> But the backend server receives the mail from the frontend server, so
> simple blacklisting will not work.
> 
> Any hint?
> 

I think you are looking for this:
http://www.postfix.org/RESTRICTION_CLASS_README.html

HTH,
Mikael


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