bouncequeue: 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/sympa/bin/bouncequeue - from package: sympa

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

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