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Microsoft.SharePoint.Client.Runtime - Mailbox unavailable. The server response was: 5.7.1 Unable to relay

    Question

  • Hello Everyone,

    I have recently deployed Timer job for email notifications in SharePoint 2013. So, the I get I'm getting emails and I see the job run successfully, but when I viewed the log file, I found this: "Microsoft.SharePoint.Client.Runtime - Mailbox
    unavailable. The server response was: 5.7.1 Unable to relay "

    Can anyone educate me what's this exactly mean.

    Thanks,

    Mike

    Friday, March 31, 2017 3:20 PM

All replies

  • Check whether you can relay in the first place. You could use a send mail script in Powershell from the SharePoint server. https://practical365.com/exchange-server/powershell-how-to-send-email/ Maybe the smtp server is not configured to accept anonymous relay for example.
    Friday, March 31, 2017 6:16 PM