sendvmsmail: 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/sbin/sendvmsmail - from package: dnet-progs

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

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