smd-push: 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/smd-push - from package: syncmaildir

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

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