nntptest: 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/nntptest - from package: cyrus-imapd-utils

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

On Debian possible default full paths are:

/usr/bin/nntptest - from package: cyrus-clients

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

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