config_list: 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 CentOS possible default full paths are:

/usr/lib/mailman/bin/config_list - from package: mailman

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/lib/mailman/bin/config_list - from package: mailman
/usr/sbin/config_list - from package: mailman

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

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