printmaillist: 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/printmaillist - from package: fastforward
/var/lib/qmail/bin/printmaillist - from package: fastforward

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

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