From: Marian Boboc (bobocilvillage.it)
Date: Mon May 28 2007 - 11:20:55 CDT

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I guess you are right; I might lookup some other ways to avoid these
inconveniences.
For a small mail server (personal) I still think it's a good solution to
avoid all the spam and the unnecessary traffic. Of course is not a solution
for the big providers, but only for very small systems with the risk of
losing some mail (you can lose it anyway in the middle of the rubbish mail).

Thank you.

-----Original Message-----
From: owner-postfix-userspostfix.org
[mailto:owner-postfix-userspostfix.org] On Behalf Of mouss
Sent: lunedì 28 maggio 2007 17.32
Cc: postfix-userspostfix.org
Subject: Re: 550

Marian Boboc wrote:
>
> Hi,
> What I want in fact is not to reject at all.
> To be more explicit I'll give an example:
>
> Spammer sends mail to user1example.com, user2example.com,
> user3example.com.
> On my system only user2example.com exists; for the other two
> destinations postfix will reject the message with 550 (the sender
> receives the notification of the rejected message) and of course the
> spammer will know that user2example.com is a valid e-mail, while the
others are not.
> This method is widely used by spammers to get valid e-mails for the
> various domains.
>

First, I am not convinced that this is true (no debate unless you have a
hard evidence). second, even if that was true, they might then consider that
all addresses are valid and you would receive more spam.

> Now, what I want is not to reply al all in these cases, just to drop
> the mail somehow.
>
>

If you know this is a spammer, reject or discard all his mail. If you don't
know this is a spammer, how do you want to make a decision?

and no, it is unacceptable to discard mail that is not guaranteed to be
spam. people do mistype addresses when sending mail, and people do send mail
to old addresses, ... etc.

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