notifyd: 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 Debian possible default full paths are:

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

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