mailbox_list_index = yes enable it in case it give error disable it again

#

# There are a few special variables you can use, eg.:

#

#   %u - username

#   %n - user part in user@domain, same as %u if there's no domain

#   %d - domain part in user@domain, empty if there's no domain

#   %h - home directory

#   %{user} - username

#   %{user|username} - user part in user@domain, same as %u if there's no domain

#   %{user|domain} - domain part in user@domain, empty if there's no domain

#   %{home} - home directory

#

# See doc/wiki/Variables.txt for full list. Some examples:

# See https://doc.dovecot.org/latest/core/settings/variables.html for full list

# of variables.

#

#   mail_location = maildir:~/Maildir

#   mail_location = mbox:~/mail:INBOX=/var/mail/%u

#   mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n

# Example:

#  mail_driver = maildir

#  mail_path = ~/Maildir

#  mail_inbox_path = ~/Maildir/.INBOX

#

# <doc/wiki/MailLocation.txt>

#

# mail_location = mbox:~/mail/:INBOX=/var/mail/%u

# Debian defaults

# Note that upstream considers mbox deprecated and strongly recommends

# against its use in production environments. See further information

# at

# https://doc.dovecot.org/2.4.0/core/config/mailbox/formats/mbox.html

# https://doc.dovecot.org/2.4.1/core/config/mailbox/formats/mbox.html

mail_driver = mbox

mail_home = /home/%{user | username}

# mail_home = /home/%{user|username}

mail_path = %{home}/mail

mail_inbox_path = /var/mail/%{user}

# Mailbox list indexes can be used to optimize IMAP STATUS commands. They are

# also required for IMAP NOTIFY extension to be enabled.

# da sa izklichi mailbox_list_index = yes shtoto beshe izkliucheno

mailbox_list_index = yes

# Trust mailbox list index to be up-to-date. This reduces disk I/O at the cost