Changing IMAP separator - does it break things?

[Sami Ketola]

> On 14. Oct 2020, at 12.51, Victor Sudakov <vas at sibptus.ru> wrote:
> 
> Those Mac clients who do not use nested folders do not seem to be
> affected. That is, I've already suggested to the Mac Mail user that he
> start Thunderbird, move all his mailboxes into the IMAP root folder, and
> then go on using Mac Mail. I hope that's what he has done.

There is a bug in Mail.app that it always assumes / as hierarchy separator and 
completely ignores server provided separator.

Not sure if anyone has created BUG to Apple about this. Atleast I have not.

Sami