sendme: 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/sendme - from package: rt-tests

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

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