Unknown message stuck in Outlook 2016 outbox Solved

  1.    #1

    Unknown message stuck in Outlook 2016 outbox

    The last two days I've noticed when I start Outlook (I have Office 365) it tries to send a message but fails and error code 0x800CCC0F is generated (see screen shots). If I send an e-mail, the e-mail is sent but whatever is stuck also tries to send. Not sure how to correct this. I've run scans with Malwarebytes and Windows Defender and nothing shows up.

    Here are some screenshots.
    Click image for larger version. 

Name:	Outlook Error 1.JPG 
Views:	18 
Size:	14.2 KB 
ID:	224969Click image for larger version. 

Name:	Outlook Error 2.JPG 
Views:	18 
Size:	39.3 KB 
ID:	224970
      My ComputersSystem Spec

  2.    #2


    I Googled the error message and came up with this:
    Fix email delivery issues for error code 550 5.1.0 in Office 365 - Office 365

    Probably as good a place to start as any and hope it helps.
      My ComputerSystem Spec

  3.    #3

    Nothing in that link applies.
      My ComputersSystem Spec

  4.    #4

    Sorry it didn't help. Not an expert on this by any means, just trying to help.

    If I search "error code 0x800CCC0F connection to server was interrupted outlook 2016" there are various results, for example here Tips to Fix Outlook Error 0x800ccc0f Connection to Server Interrupted but I cannot vouch for any of these methods.

    Hopefully someone else has some ideas.
      My ComputerSystem Spec

  5.    #5

    E-mail works, both receiving and sending. Just the mystery outgoing whatever causes that error. Thus all the links to that error assume there is some problem sending or a POP error.
      My ComputersSystem Spec

  6.    #6

    No one has come up with any other suggestions.
    I did find Outlook had changed my POP server address and would not allow me to change it to what it should be. Strange that I was still able to send and receive e-mails.

    I fixed it by restoring the disc image back to a date before the problem popped up.
      My ComputersSystem Spec


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