timsieved: 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/timsieved - from package: cyrus-common

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

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