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Invalid base64 string for MIME content: The last straw  

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Tiff_Sunbacon
(@tiff_sunbacon)
Active Member
Joined: 4 years ago
Posts: 7
February 22, 2020 7:03 EST AM  

Apple Mail is now throwing up the same error after error after error, rendering it useless. It is failing to move messages: "Invalid base64 string for MIME content." The only way out is to Force Quit. As a Mac and mail user of some 30 years I am forced to give up on Apple Mail.

This is just another, albeit more serious problem, in a long litany of bugs and irritations with Apple Mail over the last year or so. These include getting stuck downloading simple emails; inconsistent rule behaviour and frequent crashes.
I'm frequently deleting and re-adding accounts; re-installing through OS updates; cleaning the message cache and re-building mailboxes.


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Tiff_Sunbacon
(@tiff_sunbacon)
Active Member
Joined: 4 years ago
Posts: 7
February 26, 2020 9:18 EST AM  

Problem solved by deleting and re-adding the account. DOH!


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