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: > > http://www.tek-tips.com/gviewthread.cfm/lev2/3/lev3/15/pid/10/qid/725829 > > 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! > > Thanks, > -- > Adam Ellis <aellis@xxxxxxxxxxxxxx> > SaberLogic > -- +++ GMX - die erste Adresse für Mail, Message, More +++ Neu: Preissenkung für MMS und FreeMMS! http://www.gmx.net
