Daniel Faber wrote:
> On 26/05/06 14:37, Sándor Zsolt wrote:
> 
>> Is it possible to suspend/decrease the delays in the smtp sessions in
>> courier some way if the user is unknown?
> 
> Yes, it's open source software :-)

As practical advice, I recommend against doing so.  By doing so, you're 
solving the wrong problem.  If your mail filter is accepting mail 
without validating the recipients, and passing it on to courier, you can 
bet that you're going to generate a *ton* of backscatter.  Now, first, 
the problem is going to be that you're going to bounce a whole lot of 
mail to people who didn't sent it, but whose address was hijacked by 
spammers.  Eventually, the problem is going to hit you, too.  The mail 
queue on the firewall is going to fill with tens of thousands of 
messages that can't be delivered, because the recipient address is 
invalid, and can't be bounced, because the source address is invalid, 
too.  Once that happens, valid deliveries are going to start taking a 
very long time, again.

Really, you want your "firewall" to validate recipient addresses.



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