Several users have reported similar issues in the Microsoft community forum: If you are also troubled by this error, here are a couple of troubleshooting tips to help you resolve the Outlook sending error 0x80040201.
How do I fix the Outlook error 0x80040201?
1. Check your antivirus program
2. Check for add-in issues
If the error does not occur in safe mode, you may have third-party add-ins creating issues with the client’s functionalities.
3. Clear the Autocomplete list
The Outlook sending error 0x80040201 can occur due to various reasons. However, most of the time, these minor issues cause the problem. Follow all the steps listed in this article to fix the error and get your Outlook client functioning again.
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