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  • telnet to smtp is blocked bij some ISP?

    Hi all,
    I am having trouble with a SBS 2003 R2 Exhange config.
    Some email is being rejected from diffrent isp. I am also testing from diffrent ISP.
    Telnet session from ISP 1 (fig1) is blank.
    From the Second one i can connect (telnet) and also recive email.
    The 3rd ISP fig3 cannot connect to server.
    Mij MX record is pointing to 83.160.236.132
    I tought using my ISP dropmail mail server but even this is not working.

    I would appreciate your help.
    Attached Files

  • #2
    Re: telnet to smtp is blocked bij some ISP?

    Check again from the 3rd ISP that you could not connect - I think that maybe it was temp failure in your server.
    read the next link and verify that your SMTP connector is configured right:
    http://www.msexchange.org/pages/article.asp?id=54
    CNE 5, CCA, MCSE NT4.0-2003, MCSE 2003 messaging, Exchange Server MVP.
    Tzahi Kolber - IT Supervisor
    Polycom Israel.

    Comment


    • #3
      Re: telnet to smtp is blocked bij some ISP?

      Originally posted by tkolber View Post
      Check again from the 3rd ISP that you could not connect - I think that maybe it was temp failure in your server.
      read the next link and verify that your SMTP connector is configured right:
      http://www.msexchange.org/pages/article.asp?id=54
      I check it out from the 3rd ISP but it result is the same. (cannot connect)
      i have also checked the link. and SMTP virtual server.

      a nslookup to the mail domain name is ok.
      a tracert to de domain is ok.

      thanks

      Comment


      • #4
        Re: telnet to smtp is blocked bij some ISP?

        already made some traces with wireshark to see what's going wrong?
        Also it looks like you've some DNS issues (maybe not yet fully replicated??) or at least it tooks some time before i get the IP address.
        Marcel
        Technical Consultant
        Netherlands
        http://www.phetios.com
        http://blog.nessus.nl

        MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
        "No matter how secure, there is always the human factor."

        "Enjoy life today, tomorrow may never come."
        "If you're going through hell, keep going. ~Winston Churchill"

        Comment


        • #5
          Re: telnet to smtp is blocked bij some ISP?

          I performed the test from my desktop and it is worked!. I also tested your server using a web tool
          http://www.nic.funet.fi/cgi-bin/mxve...NET.FI+NETWORK
          It seems that everything is OK.
          Maybe the computer connected to ISP 3 has no access to Internet or is not allow to make smtp connections....
          Regards,
          Csaba Papp
          MCSA+messaging, MCSE, CCNA
          ...............................
          Remember to give credit where credit is due and leave reputation points where appropriate
          .................................

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