Outlook 550 5.7.515: "sending domain does not meet the required authentication level"

If Outlook.com or Hotmail rejects your mail with 550 5.7.515 Access denied, sending domain [yourdomain] does not meet the required authentication level, Microsoft is enforcing its high-volume sender rules against you. Here is what they check and the order I would fix it in. What Microsoft is asking for For domains sending large volumes to... Weiterlesen: Outlook 550 5.7.515: "sending domain does not meet the required authe…