watch-mimedefang: 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/bin/watch-mimedefang - from package: mimedefang

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

On Debian possible default full paths are:

/usr/bin/watch-mimedefang - from package: mimedefang

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

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