MaxBulk Mailer uses the standard SMTP protocol, it fully complies with the the SMTP and ESMTP RFC. The way MaxBulk Mailer send a message is identical to any other software. As a result it has to be something else. I am the MaxBulk Mailer developer.
Its so hard to understand that I send from comcast to hotmail and in hotmail receive in junk and tested to send on more then 10 hotmails with diferent ip content etc..