cyradm: 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/cyradm - 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/cyradm - from package: cyrus-admin

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

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