ipurge: 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/ipurge - from package: cyrus-common

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

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