Date:  Sun, 6 Dec 2009 09:32:39 +1100
From:  David Booth <md (at mark) goulburn.net.au>
Subject:  [coba-e:16180] Re: No such user here
To:  coba-e (at mark) bluequartz.org
Message-Id:  <cccb7bf70212d8728ec26c4b02c91c12 (at mark) goulburn.net.au>
In-Reply-To:  <026f01ca75f6$a20ee450$4001a8c0@Maxwell>
References:  <026f01ca75f6$a20ee450$4001a8c0@Maxwell>
X-Mail-Count: 16180

On 06/12/2009, at 9:02 AM, Andrew Danneffel wrote:> Hi there,>  > My Blue Quartz server is constantly being hammered with email to users => that do not exist on the server (I believe they are referred to > NDRs).  The maillog lists thousands and thousands of these "No such => user here" errors each day.  Strangely the vast majority of them are => to two domains, each which start with "a".  I don't believe the =server > is automatically sending out responses to these senders as this has > been happening for some time and the server is not blacklisted from > what I can see.  I understand that these messages are from spammers => and that the sender email addresses are spoofed.>>> I am wondering what (if anything) can be done to prevent the server > from processing and logging all of these useless messages.  I =suspect > all of these mail requests are generating significant data transfer.  => Is it simply a fact of life or can some component of the mail system => be optimized to stop it? >  > Thanks,>  > AndrewDon't you hate this? Spoofing. 'Joes'.For a few years I had a mail gateway that ran 'milter-ahead' (along with spam-assassin and clamav)http://www.milter.info/sendmail/milter-ahead/That stopped it. It would 'look ahead' and only pass on (clean) mail for existing mailboxes. Load on bq/x was much relieved.But I think it means another device/vs or smtp server -  unless the snert people can provide a way for it to work on local mailboxes.Didn't stop the data transfer though. Only way to do that would be to put it somewhere upstream.It is a commercial licence. Maybe the bx 'community' can make a deal to =get it (or something like it) adapted and included.David Booth
	
16180_2.enriched (attatchment)(tag is disabled)