pycmail: 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/pycmail - from package: pycmail

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

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