Email Norification: Invalid base64 string for MIME content

Upgraded to Catalina this morning and now receive email notifications with code above. Did not happen with Mojave.

It only happens to email sent to the email address that uses the Exchange server through Office 365 and not the AOL address. Both are being accessed on a 2014 MacBook Air suing the native Mail app.

Any thoughts on how to address this problem? The email gets through, so it is just irritating and not a loss of information.

MacBook

Posted on Oct 8, 2019 2:24 PM

Top-ranking reply

ProzitRB

Level 1

4 points

Posted on Oct 24, 2019 11:43 AM

OK. I called Apple Support. Here's what we did and so far the issue is gone.

Reboot into Safe Mode
Open Mail and send myself an email from a personal account to the Exchange Account to see if the error came up.
No error in Safe Mode
Open System Preference/Users and Groups
Select "Login Items"
Delete all items marked "Unknown" In my case there were a couple of old items from software I deleted long ago.
Reboot into Normal mode and test again.
No more error.

Lets see if that holds. Good luck!

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Email Norification: Invalid base64 string for MIME content

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