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Error Code 0x800ccc6f in Outlook 2021 and office 2019
When you try to send an email from outlook, it may end up with an error code 0x800ccc6f. Send/ receive emails may work normally when you test but when you try to do it again from outlook mail, it could throw this error code 0x800ccc6f. This error generally takes place when your account settings, you have set your SMTP e-mail server to use a secure connection, and your server does not support secure connections.

Error Code 0x800ccc6f in Outlook 2021 and office 2019

https://www.winchatsupport.com/windows-live-mail-error-code-0x800ccc6f-outlook-2010-2013-2016/