kmail-mobile: 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/kmail-mobile - from package: kmail-mobile

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

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