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Solved Outlook 365 email not sending

Discussion in 'Web & Email' started by DaveA, Oct 3, 2019.

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  1. DaveA

    DaveA Trusted Advisor Spam Fighter Thread Starter

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    David
    As of sometime after 9:00 am this morning, Outlook 365 stop sending email of all of our accounts and machines. We can receive just fine!

    We get the following "

    - Sending' reported error (0x800CCC80) : 'None of the authentication methods supported by this client are supported by your server.'

    Comcast can not find anything on their end and says that it is a Outlook 365 issue.
    Microsoft hot line keeps sending me to the Outlook.com and not to the Office Outlook support area.

    Any clues as to what is happening?
     
  2. DaveA

    DaveA Trusted Advisor Spam Fighter Thread Starter

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    More information:
    the two desk tops and running Windows 10 1903 Outlook 365 (Cat5) and a laptop Windows 8.1 and Outlook 2010 (WiFi) can not send.
    But a Windows 10 HP laptop Outlook 365 (WiFi) and a Windows 10 Outlook 2010 (Cat 5) can send.
    They all have the same Outlook settings for the servers.
     
  3. Couriant

    Couriant Trusted Advisor

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    all set to use Exchange or IMAP?
    Do you have your email on your smartphone?
     
  4. DaveA

    DaveA Trusted Advisor Spam Fighter Thread Starter

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    We use POP3 and these Outlook settings have been working for years.
    It is strange that some of the machines it works and others do not.
    We can send from our Kindle's using these Comcast accounts.
    No, I do not use these accounts on my cellphone.

    We have reset the modem/router, restarted the machines, and deleted the unsent emails from the Out box.
     
  5. DaveA

    DaveA Trusted Advisor Spam Fighter Thread Starter

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    OK, I have found that making the encryption to be Auto is allowing thing to work for now.
    But I see a Certificate error once in while.
    Will wait a while before I flag this solved.
     

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  6. DaveA

    DaveA Trusted Advisor Spam Fighter Thread Starter

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    It is still working today, so I have flagged it solved
     
    Couriant likes this.
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