Recently, there was a Spam attack against our mail servers at PERCOMCourses.com, and subsequently we were blacklisted by a major Spam Reporting Agency named SpamHaus. We have since cured the problem, but it will take a while for SpamHaus's robots to full release our mail server's IP address.
In the meantime, if you feel like your email provider is rejecting our notifications, please add firstname.lastname@example.org to your emails Contact List and/or White List. This will help report back to SpamHaus that we are not actually spammers.
We apologize for the inconvenience, and thank you for your understanding during this time.