I sort all my mail in new boxes for later use and reference, these have disappeared.
MacBook Pro - IOS 12.0.1
I cannot find them in library or elsewhere.
Where have they gone?
MacBook Pro 15″, macOS 10.15
I found a solution by logging out of my iCloud account & logging back in. As one of the previous users had experienced & had advised.
Thanks all for being there!
Hi enyamder ,
Thank you for using Apple Support Communities. We understand that your mailboxes disappeared on your Mac and we'd like to help.
See if the steps here help: Use favorite mailboxes in Mail on Mac - Apple Support
If your emails are still available on your mail account, there is a possibility that you can recreate your mailbox.
Create or delete mailboxes in Mail on Mac - Apple Support
If you still need details assistance on how to perform these steps, please reach out us here: Get Support
Cheers!
