messagingaccounts: 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/messagingaccounts - from package: qmf-examples

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

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