Bacula configuration to use sendEmail

bacula-dir.conf

. . .
Messages {
  Name = Standard
  mailcommand = "/usr/local/bin/sendEmail-backup \"[BACKUP] %t %e of %n %l\" \"%r\""
  operatorcommand = "/usr/local/bin/sendEmail-backup \"[BACKUP] Intervention needed for %j\" \"%r\""
  mail = backup-handlers@example.com = all, !skipped
  operator = backup-operator@example.com = mount
  console = all, !skipped, !saved
  append = "/var/log/bacula/bacula.log" = all, !skipped
  catalog = all
}

Messages {
  Name = Daemon
  mailcommand = "/usr/local/bin/sendEmail-backup \"[BACKUP] Alert message\" \"%r\""
  mail = backup-handlers@example.com = all, !skipped
  console = all, !skipped, !saved
  append = "/var/log/bacula/bacula.log" = all, !skipped
}
. . .

sendEmail-backup

#!/bin/bash

SMTP_SERVER=smtp.example.com
USER=smtpuser
PASSWORD=smtppassword
SENDER=backup@example.com
SUBJECT=$1
RECIPIENTS=$2

/usr/local/bin/sendEmail -q -s $SMTP_SERVER -xu $USER -xp $PASSWORD -f $SENDER -u $SUBJECT -t $RECIPIENTS

You a SMTP server to send yours emails or you enable it from Gmail configurations.