Stavros Tsolakos:
> Hi list.
> 
> Apologies for the dumb question.
> 
> Is there a way to ask postfix what local addresses it is aware of i.e
> something like:
> 
> # my_list_tool
> 
> us...@domain.com
> us...@domain.com
> ...

The Postfix query that looks user information does not support user
enumeration.

> On the contrary, is there a way to display what will do when asked to
> deliver to a specific recipient? For example:
> 
> # my_route_tool us...@domain.com
> 
> Relay to mx.domain.com

See http://www.postfix.org/ADDRESS_REWRITING_README.html#debugging
for "what-if" and for "what happened" analysis.

        Wietse

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