SMTP Protocol Returned a Permanent Error 550 5.7.1 Relaying denied.

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    sandy2810
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    #144770

    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.

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