idled: 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

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/idled - from package: cyrus-imapd

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