Unfortunately I was not able to get MBM sending out emails.
I have no idea about the reason and moreover the support
came back with "standard" statements.
therefore if you don't want to waste your time and your money,
don't purchase MBM.
What problem do you have? Most problems are related to wrong settings, your server settings, wrong authentication...etc... not really MaxBulk Mailer errors but wrong data entered by you.