I keep getting these bounce backs, works on any other domain gmail, yahoo but not outlook/hotmail. is it me or them? I am using Smartermail with all possible settings setup ie DKIM SPF ii basically get a perfect score on https://www.mail-tester.com/web-zorml
Could not deliver message to the following recipient(s):
Failed Recipient: xxxxxxxxxxxxxxxxxxxxxx
Reason: Remote host said: 501 5.5.4 Invalid domain name [DB5EUR03FT018.eop-
EUR03.prod.protection.outlook.com]