For more clarity I also attach the content of "/etc/dovecot/conf.d/15-mailboxes.conf"

mailbox Junk {

special_use = \Junk

}

mailbox Trash {

special_use = \Trash

}

mailbox INBOX/Junk { auto = subscribe special_use = \Junk } mailbox INBOX/Trash { auto = subscribe special_use = \Trash }

Thanks again