sendpage-db: 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/sendpage-db - from package: sendpage-client

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

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