messageserver: 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/bin/messageserver - from package: libqmfmessageserver1

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

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