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Re: block spam mail from lan

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  • Stan Hoeppner
    ... It would probably be best at this point for you to describe your network, your mail usage scenario, so we can give you targeted responses. I.e. is this a
    Message 1 of 8 , May 11, 2013
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      On 5/11/2013 7:34 AM, Pol Hallen wrote:
      >> And the most effective countermeasure to spam originating from devices
      >> on the LAN has nothing to do with Postfix. As most spamware in the wild
      >> today still attempts to send direct-to-MX, simply creating a TCP 25
      >> egress filter at your edge router/firewall will give the best bang for
      >> the buck. This simply means creating a rule to drop all outbound TCP 25
      >> connections except those originating from the IP of your Postfix MTA.
      >
      > I don't understand.
      >
      > Situation: A real user using browser connect to squirrelmail and send a
      > mail. It's ok.
      >
      > But if this user create a mail bomb using squirrelmail how way to spam I
      > can have this problem.
      >
      > If a drop port 25, user can send any mail.
      >
      > Or tell me what I don't understand.

      It would probably be best at this point for you to describe your
      network, your mail usage scenario, so we can give you targeted
      responses. I.e. is this a

      1. typical office environment mail server
      2. SOHO or personal server
      3. university mail server
      4. ISP mail server

      --
      Stan
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