ctl_deliver: command not found

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 Debian possible default full paths are:

/usr/lib/cyrus/bin/ctl_deliver - from package: cyrus-common

You may install the required package with command apt-get install {package}

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