Added rules without without users authorization

I have a website and it sends a lot of email to the users to confirm their form submittion

I have being receiving a lot of weird forwarding messages when sending confirmation to Hotmail/Outlook emails and it is reducing my mail server IP reputation

There is a lot of cases on this forum of people complaing about it and it seems like hackers are using some Outlook/Hotmail/Live/MSN vunerability and MS is doing nothing about it