muttprint: 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/muttprint - from package: muttprint

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

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