當我回覆某位使用outlook的用戶時, 對方系統自動回覆以下訊息

550: 5.7.515 Access denied, sending domain YAHOO.COM.HK doesn't meet the required authentication level. The sender's domain in the 5322.From address doesn't meet the authentication requirements defined for the sender. To learn how to fix this see: https://go.microsoft.com/fwlink/p/?linkid=2319303

不止outlook, hotmail及gmail亦會回覆此錯誤, 此問題已嚴重妨礙正常使用電郵, 請儘快解決