splitmail++: 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/splitmail++ - from package: swish++

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

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