crashmail: 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/crashmail - from package: crashmail

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

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