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Closing an Open Relay

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  • Closing an Open Relay

    Hello All,

    I am trying to tighten up my security so that I don't have an open relay for spam, i have configured the Virtual SMTP Server so that only people who authenticate or are from the specified list can forward email.

    Is there anything else that I can do?

    Do any of you suggest good software to block this? Maybe freeware... or what about spam prevention software? I'm interested in hearing suggestions..

    Thanks,
    Marco

  • #2
    Well we use an external company to do our virus and spam filtering (www.emailfiltering.com). We only accept mail from them (firewall rule) and they are our designated MX's. So no one can connect to us on port 25 except them (there goes anyone trying you as an open relay) and they filter all our mail for spam and viruses. Kill a few birds with one stone.
    Server 2000 MCP
    Development: ASP, ASP.Net, PHP, VB, VB.Net, MySQL, MSSQL - Check out my blog http://tonyyeb.blogspot.com

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

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    • #3
      we are behind a router and have not forwarded port 25

      nothing more free than that

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      • #4
        Originally posted by SAS
        we are behind a router and have not forwarded port 25

        nothing more free than that
        How do you get e-mail then?
        Server 2000 MCP
        Development: ASP, ASP.Net, PHP, VB, VB.Net, MySQL, MSSQL - Check out my blog http://tonyyeb.blogspot.com

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

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        • #5
          we use pop3 from our ISP to recieve emails, when we send an email it is sent via a ISP SMTP server.

          Works Great for security, but we are a small company....

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          • #6
            Originally posted by SAS
            we use pop3 from our ISP to recieve emails, when we send an email it is sent via a ISP SMTP server.

            Works Great for security, but we are a small company....
            Great for security!!?? You do know that POP3 usernames and passwords are sent unencrypted?
            Server 2000 MCP
            Development: ASP, ASP.Net, PHP, VB, VB.Net, MySQL, MSSQL - Check out my blog http://tonyyeb.blogspot.com

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

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            • #7
              yeah but its a vpn first then connection so it is secure

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              • #8
                Originally posted by SAS
                yeah but its a vpn first then connection so it is secure
                Starting to sound more secure... which ISP is it? VPN access sounds pricey.
                Server 2000 MCP
                Development: ASP, ASP.Net, PHP, VB, VB.Net, MySQL, MSSQL - Check out my blog http://tonyyeb.blogspot.com

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

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