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550 5.1.1 User unknown (in reply to RCPT TO command)

Discussion in 'E-mail Discussions' started by Rasmusbdk, Apr 1, 2016.

  1. Rasmusbdk

    Rasmusbdk Member

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    Hey there.

    One of my users recently got the following error when trying to send an e-mail:

    550 5.1.1 User unknown (in reply to RCPT TO command)

    When trying to Google the issue, everything I find is related to Exchange servers.

    Should I worry about this, or could the problem lie in the receiving end?

    Thanks!
     
  2. cPanelMichael

    cPanelMichael Forums Analyst
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