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Can you please explain why the below is happening and how I can rectify it. I get this message when I am using Microsoft Outlook 365.
I would recommend checking out this article: Cannot Send Email Rejected by the Server/Banned from using SMTP
I believe this error is associated to an Outlook mail client. We found this Microsoft Community in which you can refer to as well: https://answers.microsoft.com/en-us/msoffice/forum/all/sending-reported-error0x800ccc78/2d9d5a04-1a7...
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