synctest: 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/synctest - 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/synctest - from package: cyrus-clients

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

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