SMTP authentication


  1. janey6
    Posts : 93
    Windows10
       New #1

    SMTP authentication


    I have several gmail accounts set up and use Chrome browser. This is usually OK but I have just tried to send an email from one of my accounts which was returned saying

    the remote server is misconfigured. See the technical details below for more information.

    50 Please turn on SMTP Authentication in your mail client, or login to the IMAP/POP3 server before sending your message. mail-io1-f42.google.com [209.85.166.42]:40335 is not permitted to relay through this server without authentication.

    All other emails sent from this gmail account arrive safely but for some reason this particular message is not sent. I have tried several times to send it, without success. How do I resolve this, please?
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  3. dalchina
    Posts : 43,010
    Win 10 Pro (22H2) (2nd PC is 22H2)
       New #2

    Hi, if you search for part of your error message you may find quite a lot of helpful ideas such as

    From Gmail to G Suite: 550 Please turn on SMTP Authentication - Gmail Community

    SMTP authentication-1.png
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  4. janey6
    Posts : 93
    Windows10
    Thread Starter
       New #3

    Thanks for your reply but that doesn't seem to address the problem.
    I have an email account 'name@gmail.com'
    All emails have been sending and have been received until this one message which I tried to send yesterday. I cannot find where to set the SMTP authentication.
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  6. dalchina
    Posts : 43,010
    Win 10 Pro (22H2) (2nd PC is 22H2)
       New #4

    I have an email account 'name@gmail.com'
    - and so in the example. Are you saying that's a difference? Both are about sending from a gmail account.

    The thread is resolved by a server change- post towards the end.

    Appears to be the same or similar message.

    Anyway, as you're not happy with that, try the search for yourself and look at other results for ideas.

    You haven't said if the problem email is to a different address or the same as emails that succeed.
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