faxmsg: 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 CentOS possible default full paths are:

/usr/sbin/faxmsg - from package: hylafax+

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/faxmsg - from package: hylafax-server

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

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