bsmtp: 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 CentOS possible default full paths are:

/usr/sbin/bsmtp - from package: bacula-common

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/bsmtp - from package: bacula-common
/usr/sbin/bsmtp - from package: bareos-common
/usr/bin/bsmtp - from package: bareos-common
/usr/lib/debug/usr/sbin/bsmtp - from package: bacula-common-dbg

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

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