Invalid Base 64 String for MIMI Content

I'm using Apple Mail client with Catalina, and often throughout the day I get the attached notice, and the file to which it refers does go to the correct folder even though the notice says the file can't be moved.


But the notice is disruptive (as is the bouncing Mail icon in my Dock). Is there a way to turn off this notice?


Thank you.

Mac mini, macOS 10.15

Posted on Jul 9, 2020 12:37 PM

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Jul 14, 2020 9:11 AM in response to MichaelJonas

Hello there, Chatool!


Thanks for reaching out to the Apple Support Communities! It sounds like you're seeing an error message when your mail is moved to the appropriate folder. Check out this article for How to update the software on your Mac to be sure you have installed the latest software available for your Mac.


If you have updated and still have the error message, we would recommend reaching out to Apple directly by checking out this link to Get Support and they will be more than happy to proceed with additional steps.


Take care!

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Invalid Base 64 String for MIMI Content

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