makepercentrelay: 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/sbin/makepercentrelay - from package: courier-mta

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

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