fetchmailconf: 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/fetchmailconf - from package: fetchmailconf

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

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