Changing IMAP separator - does it break things?

[Filip Hajný]

14. 10. 2020 v 13:39, Sami Ketola <sami at ketola.io>:
> 
>> On 14. Oct 2020, at 14.20, @lbutlr <kremels at kreme.com> wrote:
>> 
>> On 14 Oct 2020, at 04:24, Sami Ketola <sami at ketola.io> wrote:
>>> 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.
>> 
>> Cite? Because no, that is not my experience at all.
>> 
>> From my maildir on my FreeBSD server:
>> 
>> # ls -lnd .root*
>> drwx------  5 89  89  512 Oct 14 05:16 .root
>> drwx------  5 89  89  512 Oct 14 02:02 .root.44
>> drwx------  5 89  89  512 Oct 14 02:02 .root.Cron
>> drwx------  5 89  89  512 Oct 14 05:16 .root.Hastur
>> … etc
>> 
>> Works fine in Mail.app on Mac OS and has for at least 16 years.
> 
> I just tested it with my Dovecot 2.2.36 setup. I did set up an account with '.' as separator and created some folders.
> First mail.app succeeded in creating test root folder but when I tried to create subfolder 'test2' under 'test' Mail.app issued
> CREATE "test/test2" folder instead of "test.test2". And then failed to list the created folder completely.
> 
> Everything worked if I did set separator to '/'

In my case, having the hierarchy separator set to '/', subfolders created using the Mail client in macOS Catalina resulted in '.folder\2esubfolder‘ on disk (2e corresponds to '.‘). I had to change the hierarchy separator to a dot.

So exactly the opposite!

-F
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