amispammer: 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/amispammer - from package: amispammer

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

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