dovecot - Oct 2019 - Mailbox INBOX sync: mailbox_delete failed

Hi.

When I run the backup I always get this error.

```
[root at mail.DOMAIN.com:~]# doveadm -o mail_fsync=never backup -D -R -u
office at DOMAIN.com imapc:

dsync(office at DOMAIN.com): Info: imapc(imap.mailbox.org:993): Connected to
2001:67c:2050:106::143:199:993 (local 2a01:4f8:c2c:6d05::1:59928)

dsync(office at DOMAIN.com): Info: Mailbox deleted: Drafts

dsync(office at DOMAIN.com): Error: Mailbox INBOX sync: mailbox_delete failed:
INBOX can't be deleted.
```

The suggested solution from this mail works, but is this still the best solution
for the error above?

https://dovecot.org/pipermail/dovecot/2016-January/102988.html

My versions are

# 2.2.36.4 (baf9232c1): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.24.2 (aaba65b7)
# OS: Linux 3.10.0-1062.1.1.el7.x86_64 x86_64 CentOS Linux release 7.7.1908
(Core)

Best regards
Alex

> On 1 Oct 2019, at 12.20, Alex La via dovecot <dovecot at dovecot.org>
wrote:
> 
> Hi.
> 
> When I run the backup I always get this error.
> 
> ```
> [root at mail.DOMAIN.com:~]# doveadm -o mail_fsync=never backup -D -R -u
> office at DOMAIN.com imapc:
> 
> dsync(office at DOMAIN.com): Info: imapc(imap.mailbox.org:993): Connected
to
> 2001:67c:2050:106::143:199:993 (local 2a01:4f8:c2c:6d05::1:59928)
> 
> dsync(office at DOMAIN.com): Info: Mailbox deleted: Drafts
> 
> dsync(office at DOMAIN.com): Error: Mailbox INBOX sync: mailbox_delete
failed:
> INBOX can't be deleted.
> ```
> 
> The suggested solution from this mail works, but is this still the best
solution
> for the error above?
With Maildir yes. Doveadm refuses to delete INBOX.

Sami

Am 01.10.19 um 11:31 schrieb Sami Ketola:
> 
> 
>> On 1 Oct 2019, at 12.20, Alex La via dovecot <dovecot at
dovecot.org> wrote:
>>
>> Hi.
>>
>> When I run the backup I always get this error.
>>
>> ```
>> [root at mail.DOMAIN.com:~]# doveadm -o mail_fsync=never backup -D -R
-u
>> office at DOMAIN.com imapc:
>>
>> dsync(office at DOMAIN.com): Info: imapc(imap.mailbox.org:993):
Connected to
>> 2001:67c:2050:106::143:199:993 (local 2a01:4f8:c2c:6d05::1:59928)
>>
>> dsync(office at DOMAIN.com): Info: Mailbox deleted: Drafts
>>
>> dsync(office at DOMAIN.com): Error: Mailbox INBOX sync: mailbox_delete
failed:
>> INBOX can't be deleted.
>> ```
>>
>> The suggested solution from this mail works, but is this still the best
solution
>> for the error above?
> 
> With Maildir yes. Doveadm refuses to delete INBOX.
Okay and with mdbox also?
https://wiki2.dovecot.org/MailboxFormat

Isn't the dbox format the preferred one for long term dovecot usage?

Do the mdbox support also Shared mailboxes, I assume yes as the solution is
based on dovecot's acl.
https://wiki2.dovecot.org/SharedMailboxes/Shared
> Sami
Regards
Alex