One of these will definitely do the trick

The Microsoft Outlook 0x800ccc0e error usually appears when the app is having trouble finding your email account. However, you can make it easier for the app to find your email account and apply a few other solutions to fix the problem. Some other reasons why you may be getting the above Outlook error include your internet connection being faulty, your SMTP email settings being incorrect, your computer’s antivirus or firewall blocking your connection, Outlook’s add-ins being problematic, and more.

Here are some solutions to fix this problem.

If you get an error message in an internet-enabled app like Outlook, check to see if your internet connection is working. For example, your connection could be down or inactive, causing Outlook to display an error message.