Mail cannot save information about your mailboxes because there isn't enough space in your home folder

I'm finding an identical issue since my Catalina upgrade. 27 (of 50) GB free on my iCloud drive and 243 (of 1120) GB free on my hard drive.

I get the error sooner and sooner the more I space I free up on my drive (emptying the trash gave me ~100 GB - it had been a while!)

Long support conversation with Apple today, first level person, just involved full power down / unplug restart, and then repairing permissions. No effect. I had to stop at that point, but they were suggesting reinstalling Catalina next. Has anyone tried that?

I have spent few hours with Apple support. They have no idea how to fix this issue. And like a bonus, my iCloud is not syncing, Adobe Illustrator keeps crushing from time to time....so I am loosing my mind :D I've had so many issues in past year. Keyboard replacement on two new MacBooks etc..

Apple Support reached out proactively, apparently based on engineering wanting to get to the bottom of this issue. I was able to capture a sysdiagnose a few minutes after one of these errors occurred and it is now in the hands of engineering.

Same problem, and unfortunately cllivesey's solution didn't work for me. I have 388 GB free space on my hard drive and 129 GB free on iCloud Drive. I'm also experiencing very high CPU usage by Mail when it is running. Along with the serious downgrades with the loss of iTunes I am definitely regretting the move to Catalina.

Hi All,

Unfortunately my solution only worked for a brief period of time and the issue re-occurred, apologies :-(.

This looks to still be a massive issue, I’ve had to roll back to Mojave. I’ve had not issues with Catalina on my MacBook Pro (except the annoying security confirmations on every app I use), only on my Mac Mini.

Hope this is resolved ASAP.

Same here. The problem had gone away for a while but reappeared this morning. Computer slowed to a crawl, disk scraping away in the background, beachball spinning, got the application out of memory warning and the Mail message reporting out of disk space.

I have the same issue. Have spent approx 3-4hrs on a number of calls with Apple support and still can't fix.

For info I have done the following:

• I have done a formatted my hard drive, done a complete reinstall from backup of Catalina - didn't work
• I have formatted my hard drive and done a clean install of Catalina and then used time machine migration assistant to bring files across - didn't work
• I have formatted my hard drive and done a completed clean install of Catalina and then manually transferred files - still isn't working.

I have approx 650GB of a 1.08TB drive free

sounds familiar!!

The apple support team have now referred my case to the Engineering department for resolution. The feedback I had today is that they have seen a small number of cases with similar symptoms so are likely to develop and release a fix in one of the software updates in the near future

I tried the fix posted by clivesey 10th Oct 2019 1:03AM but still have the same problem. I have also tried clearing out all my mails in all my accounts (iCloud mail; gmail, hotmail) and applying the fix again. Still same problem. I have lots of space on my mac ( 64GB available of a 600GB SSD/flash 'fusion' drive) and am using iCloud storage where I also have tons of available space (1,8TB available!). Hope there comes a Catalina fix soon addressing this problem.

We can try to help Apple to help us, listing the characteristics of the computers that have problems. Mine is late 2015 iMac, with fusion drive 1TBssd+24GBssd (400GB free), Intel Iris Pro Graphics 6200, 8+8GB RAM, monitor retina. With macOS 10.15.1 I've problem with Mail (there isn't enough space in your home folder...) and also downloading with Chrome (disk full).

I noticed that my first fusion SSD is SATA (1TB) and the other one is NVMExpress (24GB). My colleague with iMac 2013 and fusion drive has two SATA SSD disks instead and has no problems with Catalina. Helpful?

Great so if you have a day to waste doing all this (and still not a guaranteed fix) then fine, but Apple should be sorting this out. I have gone down those rabbit holes too many times in the past only to find it was pointless and am doing doing it again.

APPLE GET YOUR **** TOGETHER!

I just tried that and now it is even worse crashing all the time while rebuilding mailbox. Is this not an issue Apple should sort out?

I moved out folder back and now it just crashed every 5 mins, like before

"...Now, one thing I had noticed after upgrading to Catalina was that the when I went to Disk Utilities or View Storage under About This Mac I saw a "clone" of the HDD ("name of hdd - Data"). .."

That is normal.

Catalina creates HDD as a read only drive for System files and HDD Data for User files. They appear to be the same size but they are not, one is not a clone of the other.