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

Symptoms

• Folders with special characters in their names are displayed incorrectly after upgrade to Obsidian 18.0.25, e.g.:

  Gra&AXw-yna Brodzi&AUQ-ska

  ---

  Gel&APY-schte Elemente

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

  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

  ---

  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 which runs along with the update stops at the first error.

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. Run the following command to rerun the conversion:

   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