buildd-mail: 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/buildd-mail - from package: buildd

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

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