mutt-patched: 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-patched - from package: mutt-patched

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

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