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Backscatterer.org

Posted on 2010-08-17
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What is the impact for a mailserver being blacklisted onto Backscatterer.org?

Best regards,

Stefanos
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Question by:stevthym
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by:Alan Hardisty
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If you are listed on backscatter.org, then you are sending out Non Delivery Reports to spammers who are sending you spam destined for invalid recipients.
This is just as bad as being a spamer yourself and you will get your mail rejected by various companies.
The key to getting of the blacklist is to Filter Invalid Recipients or use an Anti-Spam software that can do this for you.
You have not menioned what version of Exchange you are using.  If you have Exchange 2003 then this is simple:
http://www.msexchange.org/tutorials/Sender-Recipient-Filtering.html
If Exchange 2007 / 2010, then you can use the in-built anti-spam software or as I do, use Vamsoft ORF - www.vamsoft.com - $239 per server.
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by:stevthym
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I use Exchange 2007. How can I confirm that my mailserver is sending out Non Delivery Reports to spammers?
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by:Alan Hardisty
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You have the confirmation on the backscatter.org blacklist.

If you are not using any anti-spam software or the in-built anti-spam tools in Exchange then you will be sending out backscatter.

You can set the following command in the Exchange Management Shell to enable recipient filtering:

set-recipientfilterconfig -recipientvalidationenabled:$true
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by:stevthym
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what would that command do in respect to any incoming mail?
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Alan Hardisty earned 500 total points
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The command will validate any inbound emails and if the recipient address is invalid (does not exist on your server), it will reject the message.  That forces the sender to generate the NDR message and thus you can get de-listed from backscatter.org
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by:stevthym
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thanks a lot :-)

By the way, I have installed Symantec Protection for my Exchange server but did not enable any Anti Spam policy as I always feel that some e-mails might be featured as SPAM but could be e-mails from clients etc. What do you suggest? Leave SPAM coming like this? Enable AntiSPAM policy on Symantec Protection which would even reject SPAM? Redirect all SPAm INTO A new mailbox of my Exhange?
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by:stevthym
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this is my method! but i want to make it with real numbers

public static void bubbleSort(int[] x) {

                    int n = x.length;

                    for (int pass=1; pass < n; pass++) {

                        for (int i=0; i < n-pass; i++) {

                            if (x[i] > x[i+1]) {

                                int temp = x[i];  x[i] = x[i+1];  x[i+1] = temp;

                            }

                        }

                    }

                }
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by:Alan Hardisty
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You lost me with your last comment!
What is the Symantec Product that you installed on the server?
Symantec Endpoint Protection or something else?
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by:stevthym
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Symanted Information Foundation - Mail Security for MS Exchange
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by:Alan Hardisty
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Okay - if you have bought Anti-Spam software and have installed it, then you may as well use it.
Yes - you might end up with valid emails getting blocked and I have always fought with Symantec to check the logs and figure out what happened and in the end I ditched it for Vamsoft ORF which has brilliant logs.
If you have not implemented the Anti-Spam yet, I would enable it but redirect all spam to a folder that you can review, although you will spend your life sifting through it as 95% of emails that my server receives are spam and get rejected.
It is your call as to how you configure it, but I would enable it and monitor it to see, plus let your users know what will happen if a message is caught as spam.  That way they can alert you and you can do something.
Personally I reject anything that is spam and then wait for the very ocassional phone call / email.  At which point I check my logs and tell the person contacting me that their IP is Blacklisted, their server is not configured properly or some other reason.  Most of the time they fix their problem and the mail sails through next time.
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