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  • #5.5.0 smtp error

    Hi all,

    I am getting that error sending to a recipient. pls have a look and kindly help me.
    thanks and regards,

    There was a SMTP communication problem with the recipient's email
    server. Please contact your system administrator.
    <mail.mydomain.com #5.5.0 smtp;550 Requested action not taken:
    mailbox unavailable or not local>

  • #2
    Re: #5.5.0 smtp error

    Is this a local or a remote recipient?
    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 **

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    • #3
      Re: #5.5.0 smtp error

      hi,
      it is on my local one client user. thanks

      Comment


      • #4
        Re: #5.5.0 smtp error

        You are sending an email internally?
        This error looks like anti-spam or a 3rd party email system is involved.

        Can you confirm the exact path this mail takes please?

        Outlook, Exchange to another local user doesn't seem likely to me with this message.
        cheers
        Andy

        Please read this before you post:


        Quis custodiet ipsos custodes?

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        • #5
          Re: #5.5.0 smtp error

          Hi Andy , long time no see bro.

          Yeah, we are sending to a customer. not to the internal user.
          I already check the customer mx record, it exists.

          do you think, that is due to the virus infected in my client PC ?

          thanks and regards,

          Comment


          • #6
            Re: #5.5.0 smtp error

            You too

            I would use message tracking to confirm the email leaves your Org and then speak to the recipient as the issue is likely at their end.

            You could telnet from your Exchange box to the MX record and see if you get the same error message as well.
            cheers
            Andy

            Please read this before you post:


            Quis custodiet ipsos custodes?

            Comment


            • #7
              Re: #5.5.0 smtp error

              The NDR implies that the recipient doesn't exist at the domain you're sending to. Have you used an external tool to check if the email address is valid? DNSStuff provides a host of tests if you pay a subscription fee. I'm sure there are some free email validation testers out there.

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