from.mailutils: command not found

Have You tried accessing the binary with the full path?

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/from.mailutils - from package: mailutils

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