transcheck: 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/lib/mailman/bin/transcheck - from package: mailman

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

On Debian possible default full paths are:

/usr/lib/mailman/bin/transcheck - from package: mailman

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

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