Folders with special characters are displayed incorrectly after upgrade to Obsidian 18.0.25

Symptoms

• Upgrading to Plesk Obsidian 18.0.25 has caused folders with special characters in their names to be displayed incorrectly, e.g.:

  CONFIG_TEXT: Gra&AXw-yna Brodzi&AUQ-ska

  ---

  CONFIG_TEXT: Gel&APY-schte Elemente

• The following can be found in /var/log/plesk/install/plesk_18.0.25_maildir_unicoder.log:

  CONFIG_TEXT: convutf8 failed [maildir:"/var/qmail/mailnames/example.com/john.doe/Maildir";utf7:"INBOX.Gel&APY-schte Elemente.Archiv";utf8:"INBOX.Gelöschte Elemente.Archiv"]
  doveadm(john.doe@example.com): Error: Can't rename mailbox INBOX.Gel&APY-schte Elemente.Archiv to INBOX.Gelöschte Elemente.Archiv: Mailbox doesn't exist: INBOX.Gel&APY-schte Elemente.Archiv 
  failed to convutf8 /var/qmail/mailnames/example.com/john.doe/Maildir

  ---

  CONFIG_TEXT: doveadm(jane.doe@example.com): Error: User doesn't exist

  Note: The above error is shown because the user doesn't have a mailbox configured in Plesk.

Cause

Bug PPPM-11757 in Plesk. The converter tool stops at the first error when running alongside the update.

Resolution

Warning: Make sure Plesk Obsidian 18.0.26 or later is installed. If not, upgrade Plesk to the latest version. Then, perform the following steps:

1. Connect to the server via SSH.

2. To rerun the conversion, run the following command:

   For Debian/Ubuntu:

   # /usr/lib/plesk-9.0/maildir_unicoder --convutf8 --skip-errors

   For CentOS/CloudLinux/RedHat:

   # /usr/lib64/plesk-9.0/maildir_unicoder --convutf8 --skip-errors