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  • Exchange SMTP mail failing

    Hi all

    I have a sbs 2000 server that is having a problem sending smtp mails to certain domains. Most mail sends fine but it appears that random mails fail to connect to the remote mail server and eventually an NDR bounces back saying unable to connect to host. I have checked with our ISP and they say we are not on any black lists or spam lists and I have achecked with one of the problem domains and they say they are not blocking us.
    If I try to connect to the mail domain by using telnet mail.problemdomain.com 25 I get the error message connect failed so something is blocking us getting to these domains and becuase its random domains is quite a problem!
    The server itself it runnign sbs 2000 with exchange sp2 and all other patches are up to date.
    thanks for any help you can offer
    Mark

  • #2
    Re: Exchange SMTP mail failing

    Try to relay emails to this domains via SMTP connector and the SMTP server of the ISP.

    http://support.microsoft.com/kb/265293

    There might be some antivirus/antispam etc. that block you from sending mail from you domain or IP.

    Regards,

    Yuval
    Best Regards,

    Yuval Sinay

    LinkedIn: https://www.linkedin.com/in/yuval14, Blog: http://blogs.microsoft.co.il/blogs/yuval14

    Comment


    • #3
      Re: Exchange SMTP mail failing

      I would also try telnet mail.problemdomainIP.com 25 to see if it is a DNS problem. If so, you may have some stale DNS records cached on your server. Start by running ipconfig /flushdns from a cmd prompt.
      HTH
      TIA

      Steven Teiger [SBS-MVP(2003-2009)]
      http://www.wintra.co.il/
      sigpic
      Iím honoured to have been selected for the SMB 150 list for 2013. This is the third time in succession (no logo available for 2011) that I have been honoured with this award.

      We donít stop playing because we grow old, we grow old because we stop playing.

      Comment


      • #4
        Re: Exchange SMTP mail failing

        Sorry - my previous post should have said:
        telnet ProblemDomainIP.com 25
        and not as written
        TIA

        Steven Teiger [SBS-MVP(2003-2009)]
        http://www.wintra.co.il/
        sigpic
        Iím honoured to have been selected for the SMB 150 list for 2013. This is the third time in succession (no logo available for 2011) that I have been honoured with this award.

        We donít stop playing because we grow old, we grow old because we stop playing.

        Comment


        • #5
          Re: Exchange SMTP mail failing

          Argghhh

          telnet ProblemDomainIP 25

          Ineed a holiday !!!!
          TIA

          Steven Teiger [SBS-MVP(2003-2009)]
          http://www.wintra.co.il/
          sigpic
          Iím honoured to have been selected for the SMB 150 list for 2013. This is the third time in succession (no logo available for 2011) that I have been honoured with this award.

          We donít stop playing because we grow old, we grow old because we stop playing.

          Comment

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