dkimproxy.out: 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/dkimproxy.out - from package: dkimproxy

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

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