Thank you for your reply, I will ty to contact their postmaster and see what I can get done about it.

Dear MagicSpam team, one of my clients reported his mail bouncing when trying to contact a business partner of his. The rejection message reads "You have been blacklisted. See http://spamauditor.org/best-practices/empowering-your-users/ for more information. Protection provided by MagicSpam 2.0...