From mboxrd@z Thu Jan 1 00:00:00 1970 From: "gustav gundacker" Subject: Re: SMTP Routing Based On Recipient Date: Tue, 23 Dec 2003 22:57:18 +0100 (MET) Sender: netfilter-admin@lists.netfilter.org Message-ID: <30807.1072216638@www24.gmx.net> References: <1072121282.10935.12.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Errors-To: netfilter-admin@lists.netfilter.org List-Help: List-Post: List-Subscribe: , List-Id: List-Unsubscribe: , List-Archive: To: aellis@saberlogic.com Cc: netfilter@lists.netfilter.org a solution is smtpd/smtpfwdd from juniper see http://www.obtuse.com/smtpd.html gunnar > I am running a MS Exchange 5.5 server and am getting hit with the NDR > (non-delivery report) Reverse Spam Attack as described here: > =20 > http://www.tek-tips.com/gviewthread.cfm/lev2/3/lev3/15/pid/10/qid/725829 >=20 > As the thread describes, there is no way to just turn off NDRs in > Exchange 5.5 - Microsoft is recommending third party utilities. What I > am wondering is this - would it be possible to redirect SMTP to my Linux > server, use iptables to check that the recipient matches a valid user > >from a list I'd supply, and, if so, route the message to the Exchange > server? And, if no valid recipient is found, the message is simply > dropped. Is this even a logical way to handle this situation? Should I > be looking at something like snort instead? I'm all ears! >=20 > Thanks, > --=20 > Adam Ellis > SaberLogic >=20 --=20 +++ GMX - die erste Adresse f=FCr Mail, Message, More +++ Neu: Preissenkung f=FCr MMS und FreeMMS! http://www.gmx.net