Mailbox INBOX sync: mailbox_delete failed

[Alex La]

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