zarafa-dagent: 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/zarafa-dagent - from package: zarafa-dagent

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

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