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SMTP Protocol Returned a Permanent Error 550 5.7.1 Relaying denied.

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  • SMTP Protocol Returned a Permanent Error 550 5.7.1 Relaying denied.

    Guys we are facing an issue sending mails to only one particular domain. Following is the error message.
    "SMTP Protocol Returned a Permanent Error 550 5.7.1 Relaying denied. Proper authentication require"

    We are using Lotus Domino as mail server. Any suggestions please.

  • #2
    Re: SMTP Protocol Returned a Permanent Error 550 5.7.1 Relaying denied.

    I'm sure there's someone here that knows what issue you are dealing with. However, this is an Exchange 2000/2003 support sub-forum, not a general mail sub-forum.
    GoogleFu is strong with this one ^

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