Email Norification: Invalid base64 string for MIME content

Moving your user data into the "test" user won't fix the problem. It will just migrate it over. if it works in the test user the issue is user specific.

Call Apple Care @ 800 275 2273 and report this base64 MIME MS Exchange error.

Apple needs to fix this problem. Apple not fixing this base64 bug in its first bug fix release implies that Apple doesn’t understand the issues behind this problem. Most Mac users are not going to go through what ProzitRB did nor should they. Everyone who gets this problem must call Apple Care to report this.

Everyone getting the base64 MIME should call Apple Care to report this problem (800-275-2273). Problems identified here are not seen by Apple. If you want a fix CALL!

There is a much easier way to workaround this problem than this method. Such as just disabling all rules, that’s it. Since apple has yet to fix this problem indicates the problem is in Catalinas OS.

They told me I was the first too, which means nothing. To solve an Apple bug with a Microsoft Outlook

APP is not a fix Apple wants. Steve Jobs would roll over in his grave. Also outlook is not free you have to buy it as part of an office 365 suite, about $99 year. Everyone who hasn’t should call Apple Care to report this.

I had a case opened with Apple and my company IT.

No one knows about the problem and couldn't do anything.

My issue with invalid base64 appeared once a while but when it happened, i see move message status info bottom left of the mail.app appeared to be stuck until i restart it.

I had to install Outlook and no issue whatsoever, I had few paid plugin for mail.app so i wanted to keep using it then i feel like i lost interest using mail.app any more to be honest.

Apple can't even make their own application working on their own OS. I think Apple is going back to the darkest time of their history again.

Anyway if i hear back from Apple or internal IT, i'll update here.

Regards,

Brendon

Apple is not truthful when they say they have no idea about this problem. This is lack of integration with Microsoft Exchange! They have a very comforting system of escalating to "higher levels" within their support community and engineers that cause you to reexplain the problem and more days pass. You can ask if they have ever heard of this problem before and they so "no, you're the only one", then you go search the internet and find that this is a known problem that Apple customers are screaming about.

More disappointing is that I have been buying my employees Mac's to replace their PCs. I push the Apple eco-system. . . but now I have to go back to all of them who are using Macs and tell them to go back to using Outlook so that their Mail will work. Once they switch to Outlook-they systematically move away from the entire Apple world- Calendar, Notes, Contacts, etc. start to fall one by one and then they are back in the PC world using a piece of Apple hardware. I lose the value of buying my entire team Mac's.

I hope Apple can get back to a solid ecosystem that works without constant issues they can't acknowledge and provide solutions.

Apple is not truthful when they say they have no idea about this problem. This is lack of integration with Microsoft Exchange! They have a very comforting system of escalating to "higher levels" within their support community and engineers that cause you to reexplain the problem and more days pass. You can ask if they have ever heard of this problem before and they so "no, you're the only one", then you go search the internet and find that this is a known problem that Apple customers are screaming about.

More disappointing is that I have been buying my employees Mac's to replace their PCs. I push the Apple eco-system. . . but now I have to go back to all of them who are using Macs and tell them to go back to using Outlook so that their Mail will work. Once they switch to Outlook-they systematically move away from the entire Apple world- Calendar, Notes, Contacts, etc. start to fall one by one and then they are back in the PC world using a piece of Apple hardware. I lose the value of buying my entire team Mac's.

I hope Apple can get back to a solid ecosystem that works without constant issues they can't acknowledge and provide solutions.

I upgraded today to Catalina latest version 10.15.2 because this morning my internal speaker went missing, didn't do a thing! Then I see all this updates required on 10 December 2019. I called apple support as Email Notification: Invalid base64 string for MIME content. That outlook didn't have this problem with exchange, my phone is fine in accepting emails, but mac pro 15-inch 2017 not accepting microsoft Office 365 through it. Apple saying that they need an engineer to look at it now. They want to change my settings. Why don't they fix the update their end????? Especially as the problem has been around for a long time but the first two persons with apple care never heard of this problem. When you load up the latest version it loads apps like the appletv and other apps I don't want. These updates are a way to stop users being able to access content using other providers. In Italy only on the radio did we hear via Austalia, that these big firms are being sued because they are controlling what data we can access or making the products so useless that we tend to through them out and purchase a new product.

Let's see if they can fix it. I said I want to hand it in and get refund. I can't continue working when it has taken up my day having to fix my computer because of their updates being unfit for purpose. Also apple blocking me being able to access content through other providers.

We need to keep calling apple support so all these work arounds are proven to not work.

Apple is only aware if you call them. They don't read these threads. Call Apple Care Support.

I think it is an idea worth trying. I do indeed think it rebuilds the database, so it should not be detrimental. You could save the database somewhere else if you would need to recover it.

I am having the same issue. Very annoying to have to acknowledge popup. I have been contemplating moving to Outlook 365 for a while. This may be the straw.

If anyone has fixed this problem please let me know.

Issue started after upgrading to 10.15

I'm having the same issue with Mail after upgrading to Catalina. It's from various senders who come into my Junk folder. When I click OK to the popup, the email is unreadable. However, if I open it in the Junk folder, I can.

Very annoying. I'll be delighted if we can find a solution to this.