Sándor Zsolt wrote:
> 
> I see, this is a self protection method. It's okay - I think - if the server 
> is directly on the Internet, but in our case it is behind a firewall what 
> does a prefiltering and relays the good domained messages to the mail server. 
> (The firewall can not check wheather the user in the domain exists or not it 
> simply relays all of them.)

What software is this firewall running?  At my previous job, we were 
running Sophos PureMessage, which had no native capability to validate 
recipients.  However, the system was flexible enough that there were two 
rather simple methods of introducing recipient validation.  Since the 
product used sendmail as its MTA, we set up a job to build a full list 
of recipients (users and aliases), and create a new virtusertable on the 
filtering host.  Another option would have been to create a "list" of 
addresses in the products UI, and then create a rule that rejects 
recipients not in that list.

Whatever you're using almost certainly will allow you to do one of those 
two.  I never saw a product that wouldn't, when I was evaluating 
different solutions.


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