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How Can i stop Spam in Exchange 2003

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  • How Can i stop Spam in Exchange 2003

    What is the best way to stop spam in exchange 2003, my users got a commercial mail they don't want it, even it come to the junk mail folder in outlook, but i want also to prevent it from the server, and even some of it don't come to juck mail


  • #2
    Re: How Can i stop Spam in Exchange 2003

    Originally posted by Mr.Fox2000 View Post
    What is the best way to stop spam in exchange 2003, my users got a commercial mail they don't want it, even it come to the junk mail folder in outlook, but i want also to prevent it from the server, and even some of it don't come to juck mail

    Disconnecting the network cable on the Exchange Server seems quite effective. I haven't had any spam for weeks!

    Seriously, there is NO way of getting rid of all spam as the spammers come up with new and exciting ways of marketing their highly desirable products every day.
    On the Exchange side, configure IMF and make sure the monthly updates are installed
    On the Outlook side, enable cached messages and Junk mail will come on by default
    Adjust the IMF levels to be less tolerant, but note this will block some real emails
    Consider a third-party solution

    Good luck!
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

    ** Remember to give credit where credit is due and leave reputation points where appropriate **

    Comment


    • #3
      Re: How Can i stop Spam in Exchange 2003

      I have had lots of luck with spamhaus DNS.

      In the past month or so 1086781 queries and 568837 connections denied.
      Thats half a million messages that where not accepted by the server, and zero complaints from the users, trust me they will complain, about missing emails. Ya!

      Then I use IMF.
      4178 scanned 1582 archived as suspect.



      (Hmm, why do those numbers not add up?, One sec I have to figure this out)

      Got it: Because of failed directory lookup. Once accepted by the server the lookup blocks most and does not even pass by IMF.
      Last edited by Lior_S; 13th August 2007, 16:05. Reason: More info
      "...if I turn out to be particularly clear, you've probably misunderstood what I've said” - Alan Greenspan

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      • #4
        Re: How Can i stop Spam in Exchange 2003

        My preferred combination at the moment is Greylisting and IMF. That is dealing with most spam that is sent to my Exchange server and those of my clients.

        I don't use blacklists myself as I don't like the idea of someone else deciding what email I receive.

        There is no 100% effective method though - if there was then we would all be using it and spam wouldn't be a problem.

        Simon.
        --
        Simon Butler
        Exchange MVP

        Blog: http://blog.sembee.co.uk/
        More Exchange Content: http://exchange.sembee.info/
        Exchange Resources List: http://exbpa.com/
        In the UK? Hire me: http://www.sembee.co.uk/

        Sembee is a registered trademark, used here with permission.

        Comment


        • #5
          Re: How Can i stop Spam in Exchange 2003

          Originally posted by Sembee View Post
          My preferred combination at the moment is Greylisting and IMF. That is dealing with most spam that is sent to my Exchange server and those of my clients.

          I don't use blacklists myself as I don't like the idea of someone else deciding what email I receive.

          There is no 100% effective method though - if there was then we would all be using it and spam wouldn't be a problem.

          Simon.
          agreed, though I am more than happy for someone else to figure out what is spam .

          Mr.Fox2000-
          I hope this answered your questions, spam filtering is a fine art. Each one of the above mentioned technologies is only part of the toolkit to fight spam, and it keeps changing.......
          "...if I turn out to be particularly clear, you've probably misunderstood what I've said” - Alan Greenspan

          Comment


          • #6
            Re: How Can i stop Spam in Exchange 2003

            Originally posted by Lior_S View Post
            agreed, though I am more than happy for someone else to figure out what is spam .
            One person's spam is another's valuable message.

            I have a story I drag out every now and then.
            I did an Exchange deployment for a client last summer. Financial services. Mortgages etc. They didn't sell direct, but through brokers, mainly one man bands. Some queries came in through their branded web sites as well.
            We went through every spam product on the market - and I do mean every one. Not one would allow all legitimate email through. One blocked email could be the loss of business worth many thousands.
            It actually reached the point where they were going to hire someone to manually filter the spam, because it only needed one false negative a year to be pay their salary and additional costs.
            However eventually one of the major outsourcers offered to build a custom solution. It wasn't cheap and has high ongoing costs, but it works.

            The point I am getting across is that when you are looking at solutions, don't look purely at what it lets through (or not) but what it stops. If it is stopping legitimate email then the solution is no good for you.
            For my money, blacklists stop too much legitimate email - because one legitimate email is too many.

            Simon.
            --
            Simon Butler
            Exchange MVP

            Blog: http://blog.sembee.co.uk/
            More Exchange Content: http://exchange.sembee.info/
            Exchange Resources List: http://exbpa.com/
            In the UK? Hire me: http://www.sembee.co.uk/

            Sembee is a registered trademark, used here with permission.

            Comment


            • #7
              Re: How Can i stop Spam in Exchange 2003

              www.appriver.com

              Inexpensive and VERY effective!!!! been using them here for close to 3 years and couldn't be happier.

              Comment


              • #8
                Re: How Can i stop Spam in Exchange 2003

                the best way is to stop spam before it reaches your exchange server, because once it's there - valuable resources are wasted in order to tag and filter it.
                IMHO the best way is a linux+spamassassin box in DMZ. I run proxmox which is a turn key server (everything comes pre-configured) with 99% spam detection rates and very little false positives. best of all - the basic version is totally free for commercial use (supports one domain name only)

                good luck!

                Comment


                • #9
                  Re: How Can i stop Spam in Exchange 2003

                  I'm using ORF by vamsoft and it seems to be doing a pretty good job. They offer a 30day evaluation and licensing is extremely cheap. It has a very easy to use interface and all of the basic techniques for spam filtering.

                  I turned on greylisting and it does really nice at stopping a majority of spam...however, some people don't like the delay. You'll have to add senders and IP address to the whitelist so those people don't need greylisting.

                  Pair it with IMF and you'll be set.

                  Comment


                  • #10
                    Re: How Can i stop Spam in Exchange 2003

                    Dear All,

                    thank you all for your hep and your time,

                    so., i see that all of your openions go to one direction, which is that "i had to use a third-party application to block spam", regardlesss which is the application.

                    so, can i understand from that the Exchange Built-in tools is not enough alone ???

                    i want your openion as exprets ????

                    Comment


                    • #11
                      Re: How Can i stop Spam in Exchange 2003

                      Personally I am happy with Exchange IMF but I accept a certain amount of spam gets through both IMF and Junk Mail -- perhaps 5 to 10% of the total spam I recieve. For me this is just about acceptable but for some of my clients they want a 3rd party add in.

                      For you this may not be an acceptable level -- you will have to decide.

                      Tom
                      Tom Jones
                      MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
                      PhD, MSc, FIAP, MIITT
                      IT Trainer / Consultant
                      Ossian Ltd
                      Scotland

                      ** Remember to give credit where credit is due and leave reputation points where appropriate **

                      Comment


                      • #12
                        Re: How Can i stop Spam in Exchange 2003

                        IMF does a good job, but it lacks keyword filtering and greylisting...althought I'm still up in the air about greylisting, more and more companies are using it.

                        Comment


                        • #13
                          Re: How Can i stop Spam in Exchange 2003

                          Pinjo Revealer is a simple one. If your on the cheap it is free, but it watermarks your e-mail with their ad. It is only $150 per install to get the full version.

                          It is a Windows port of Spam Assasin.

                          Comment


                          • #14
                            Re: How Can i stop Spam in Exchange 2003

                            Originally posted by gosavi View Post
                            IMF does a good job, but it lacks keyword filtering and greylisting...althought I'm still up in the air about greylisting, more and more companies are using it.

                            If your inbound email is not time sensitive to the second (and anyone who has built a business model that relies on instant email delivery and doesn't tolerate any delay is a fool) then greylisting will make an immediate impact. When I first tried it the users could tell when I turned it off, almost to the minute.
                            If you are going to use greylisting then get something that auto whitelists. Most of my email is not affected by greylisting at all, because the addresses are auto whitelisted.

                            Simon.
                            --
                            Simon Butler
                            Exchange MVP

                            Blog: http://blog.sembee.co.uk/
                            More Exchange Content: http://exchange.sembee.info/
                            Exchange Resources List: http://exbpa.com/
                            In the UK? Hire me: http://www.sembee.co.uk/

                            Sembee is a registered trademark, used here with permission.

                            Comment

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