escape: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/escape - from package: mailavenger

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