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  • Undeliverable Mail

    Im running SBS2003, all Outlook 2003 clients.

    A few of my users are unable to send external email. Office of 40 people, 2 can not send email externally. Everyone using exchange as their outgoing email server.

    They recieve the error below right after they send the message.
    Any suggestions?


    There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.

    <abc.com #5.5.0 smtp;550 You must check your mail from this IP or SMTP Auth before sending to [email protected]>

  • #2
    It seems to think they're attempting to relay. Are they external users?
    Andrew

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

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    • #3
      All users are internal, on the same subnet.

      I logged in on a test machine as one of the users that was having problems. I tried sending an external email and received the error.
      I logged out of the pc, and logged back in as me, and everything works fine. ?

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      • #4
        Did you check to see if your all in different groups?

        Check you SMTP authentication settings....

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        • #5
          Did you check to see if your all in different groups?

          Check you SMTP authentication settings....

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