gpg-remailer: 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/gpg-remailer - from package: gpg-remailer

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

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