mutt-org: 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/mutt-org - from package: mutt

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

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