Anton Basistov wrote:
> 
> Ok. I'll ask from another side.
> Can I configure Courier not to tell me about the wrong addresses? Even if my 
> mail client very bad?

Yes, it can, but not selectively.  That is, if you want courier to be 
quiet about bad addresses, and bounce them, it will behave that way for 
your users and also for the internet at large.  What will then happen is 
spammers will attempt dictionary attacks against your mail server to get 
valid addresses, and will generate all positives.  They'll then send 
huge volumes of spam to your server, which courier would accept and then 
try to bounce.  The spam would have a bad return address, and then sit 
undeliverable in your mail queue for a very long time before bouncing to 
the postmaster.

The end result is that you can't read postmaster mail because there are 
too many messages, and you can't determine whether or not there's any 
valid problems with your mail server.  The problem increases until your 
mail queue is full of thousands of messages which can't be delivered, 
and legitimate service degrades until it's not usable any more.

Don't go down that road.  It sucks.


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