Apple Mail rules do not find the mailbox to be moved
Dear Support Community,
I like it when my e-mails are automatically sorted into the various mailboxes I have created.
However, lately I get the error message that mailbox XYZ does not exist (although it still exists in Apple Mail). If I edit the rules and refer to the desired mailbox again, this works until I close Apple Mail and open it again at a later time.
This problem occurs primarily when using the Gmail addresses (see an example below). Creating new rules does not solve the problem. All software is up-to-date.
Do you have an idea how I can solve the problem?
Many greetings
JedesBild
PS: I could not find a suitable topic for this problem (e.g. Mail) - I hope macOS Catalina is okay.
MacBook Pro 15”, macOS 10.15