Re: [exim] How to send bounce messages just after error

Finally I have used the reject at RCPT time. It was my first idea, but I
have to test all the ways.

Thank you !



> On Mar 5, 2007, at 11:46 AM, lista_exim@??? wrote:
>
>
>> Hi!
>>
>> When I receive a message to an false user of my system, I want to
>> send a
>> bounce message to the original sender just after the error, and I
>> don't
>> want Exim send the original message to the queue.
>>
>
> I used to do that because my incoming mx was only a frontend,
> accepting all users for my domains and then trying to send them
> onwards. It was a Bad Idea [tm]. (Rather, it was something I hadn't
> thought about yet). It makes your queue fill up faster than a woman's
> shopping cart in a discount store. At one point I had over 20000
> (yes, twenty thousand) undeliverable bounces. Why? Because most spams
> are sent with forged non-existent recipient addresses, and the
> remainder is sent using forged recipient addresses that do exist. So
> in essence:
>
> - You send lots of people bounces who never sent you an e-mail in the
> first place (forged existing recipient addresses)
> - Your queue fills up with frozen messages because of all the bounces
> that couldn't be delivered. (forged non-existent recipient addresses).
>
> I now reject unknown sender addresses at MAIL time, and unknown
> recipients at RCPT time. The only mails getting stuck on my queue now
> are mails from locally submitted clients.
>
> You really, really want to reject at RCPT time.
>
>
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