bulk.pl: 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/lib/sympa/bin/bulk.pl - from package: sympa

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