pinq: command not found

Have You tried accessing the binary with the full path?

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/pinq - from package: qmail
/var/lib/qmail/bin/pinq - from package: qmail

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