Forum Discussion
Office 365 IP black list and email bounce from Outlook.com
Outlook.com and Office 365 are different systems in the back end, so they don't have control over each other's settings.
Having said that, the reply you SHOULD have been given from Office 365 support is that they would look into why their IP addresses had been blocked by SORBS, Slashback etc. You're right - it's not your job to get them un-blacklisted. The golden rule of requesting a blacklist removal is to first ensure the reason for the listing has been addressed - something which you have no control over.
Did you raise this as a support ticket within the Office 365 Admin Centre? Reply to the ticket and tell them they need to work on becoming unlisted by the various services (not just Hotmail).
Keep us posted.
-Sonia
The reason why I said both outlook and Office 365 run same back end because office mail sending server hostname is DB6PR0202MB2613.eurprd02.prod.outlook.com. Even office 365 autodiscover is something like autodiscover-apacnorth.outlook.com. Which are obviously part of outlook.com domain.
I did reply them the same about a week ago and still they haven't responded. I raised this ticket almost 2 weeks ago as service unavailability and still no action has been taken by office 365 support team.