Microsoft’s email security is unexpectedly blocking legitimate business mail – Computerworld

Larger organizations miss DMARC on secondary domains, regional domains, and the subdomains that their marketing and billing platforms send from for mundane reasons. No one owns the domain name system (DNS), and “people fear breaking legitimate mail sent by third parties,” Dickson said.

Quiet, inconsistent failure

As MailRoute pointed out, what makes this particular malfunction so dangerous is its inconsistency: The person who sent the message sees a bounce “full of acronyms, assumes a glitch, and moves on.” Meanwhile, the customer never knows a message was sent.

It fails quietly, which is “the bane of an email marketer’s existence,” Dickson said. Customers, patients, job applicants, and others use Hotmail, Outlook, Live, and MSN, and when invoices, password resets, appointment confirmations, and offer letters go missing, the customer thinks they’re being ignored, not necessarily that the message is not getting through.