Correct. This is the feature I was referring to. It works very well in my experience.
On Thu, Jun 3, 2010 at 8:45 AM, Kennedy, Jim <kennedy...@elyriaschools.org>wrote: > We might be talking about something else here, it isn’t an rdns check to > avoid creating backscatter. It is a system to prevent your users from > getting it if they are spoofed in the ‘from’ of a spam run. The Cuda acts > as your outgoing mail relay and as it passes the email it tags all outgoing > email. It also acts as your incoming MTA of course…..when it gets an NDR > from the outside world it then checks to see if that NDR matches a message > sent by your org using that tagging system. If it doesn’t match it rejects > it. It flat out kills incoming backscatter when your user’s ‘from’ is used > to forge a spam run. > > > > > http://www.thefreelibrary.com/Barracuda+Spam+Firewall+Rejects+Invalid+Non-Delivery+Report+%28NDR%29+...-a0183406988 > > > > > > > > *From:* Mark Tibbet [mailto:m.tib...@gmail.com] > *Sent:* Wednesday, June 02, 2010 9:15 PM > > *To:* MS-Exchange Admin Issues > *Cc:* MS-Exchange Admin Issues > *Subject:* Re: Several NDR's > > > > All they are really doing is a rdns check to prevent spoofing. Most mta's > should be capable. The only one if found that doesn't is message labs. Just > my .02. > > > > Regards, > > > > Mark Tibbet > > Systems Engineer > > Enterprise Networking Solutions, Inc. > > mtib...@ens-inc.com > > Http://www.ens-inc.com > > > > > On Jun 2, 2010, at 4:37 PM, Richard Stovall <rich...@gmail.com> wrote: > > Totally agree about the Barracuda spoofing protection. I use it and it's > wonderful. I've had zero reports of backscatter problems since implementing > about a year ago or so. > > > > <furiously knocks on the closest wooden object> > > On Wed, Jun 2, 2010 at 10:56 AM, Kennedy, Jim < > kennedy...@elyriaschools.org> wrote: > > Some spam filters can help. Barracuda for example can be set up to relay > your outbound email and it keeps a record of your outbound email message > ID's. You then also use the Barracuda for incoming email. Then when it > gets an NDR it checks it against that message ID list, if it isn't on that > list it rejects it. > > > > > -----Original Message----- > From: Brent Zalewski [mailto:bzalew...@comcast.net] > Sent: Wednesday, June 02, 2010 10:29 AM > To: MS-Exchange Admin Issues > Subject: RE: Several NDR's > > As I read through all the articles on this I really wonder what if anything > can be done. Some articles say to report this and other say just to ignore > it. What really is the best solution , if any? > > Thanks > > > >
