html2msg: 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:

/var/lib/wims/public_html/bin/html2msg - from package: wims

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

Error in other languages:
html2msg: bevel nie gevind nie
html2msg: comandă negăsită
html2msg: comando não encontrado
html2msg: commande introuvable
html2msg: command not found
html2msg: käsku ei ole
html2msg: không tìm thấy lệnh
html2msg: komanda nerasta
html2msg: Kommando nicht gefunden.
html2msg: kommandot finns inte
html2msg: komut yok
html2msg: nie znaleziono polecenia
html2msg: níor aimsíodh an t-ordú
html2msg: no se encontró la orden
html2msg: no s'ha trobat l'ordre
html2msg: opdracht niet gevonden
html2msg: parancs nem található
html2msg: perintah tidak ditemukan
html2msg: príkaz nenájdený
html2msg: příkaz nenalezen
html2msg: команда не найдена
html2msg: командата не е открита
html2msg: 命令找不到
html2msg: コマンドが見つかりません