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550 Please turn on SMTP Authentication

Discussion in 'E-mail Discussion' started by Glen M., Jan 17, 2019.

  1. Glen M.

    Glen M. Registered

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    Yesterday, out of the blue, messages to our domain began bouncing back to senders with the message

    550 Please turn on SMTP Authentication in your mail client. [removed] is not permitted to relay through this server without authentication.

    This was only affecting senders that use G-mail so I added an etry to the SPF record - but no luck: +include:_spf.google.com

    Suggestions?
     
  2. LoadFactor

    LoadFactor Active Member

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    Same here. This fixed the issue: Please turn on SMTP Authentication

    Next: figure out what the heck went wrong.
     
  3. KrisG

    KrisG Member

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    I would strongly suggest leaving SMTP authentication on even after you figure out what went "wrong", IMHO.
     
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  4. cPanelLauren

    cPanelLauren Forums Analyst II Staff Member

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    To clarify this is only senders that are sending your domain mail from gmail? Do you mean senders who use gmail to send/receive their messages?
     
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