bbmail: 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/bin/bbmail - from package: bbmail

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

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