zarafa-mailbox-permissions: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/zarafa-mailbox-permissions - from package: zarafa-utils

You may install the required package with command yum install {package}
Error in other languages:
zarafa-mailbox-permissions: bevel nie gevind nie
zarafa-mailbox-permissions: comandă negăsită
zarafa-mailbox-permissions: comando não encontrado
zarafa-mailbox-permissions: commande introuvable
zarafa-mailbox-permissions: command not found
zarafa-mailbox-permissions: käsku ei ole
zarafa-mailbox-permissions: không tìm thấy lệnh
zarafa-mailbox-permissions: komanda nerasta
zarafa-mailbox-permissions: Kommando nicht gefunden.
zarafa-mailbox-permissions: kommandot finns inte
zarafa-mailbox-permissions: komut yok
zarafa-mailbox-permissions: nie znaleziono polecenia
zarafa-mailbox-permissions: níor aimsíodh an t-ordú
zarafa-mailbox-permissions: no se encontró la orden
zarafa-mailbox-permissions: no s'ha trobat l'ordre
zarafa-mailbox-permissions: opdracht niet gevonden
zarafa-mailbox-permissions: parancs nem található
zarafa-mailbox-permissions: perintah tidak ditemukan
zarafa-mailbox-permissions: príkaz nenájdený
zarafa-mailbox-permissions: příkaz nenalezen
zarafa-mailbox-permissions: команда не найдена
zarafa-mailbox-permissions: командата не е открита
zarafa-mailbox-permissions: 命令找不到
zarafa-mailbox-permissions: コマンドが見つかりません