Internetln

Outlook - m.hotmail.com
...Access your Outlook email account or create a new one easily....
https://m.hotmail.com/mail/?bO=1

Smart Network Data Services - postmaster.hotmail.com
...Outlook.com Smart Network Data Services Deliverability to Outlook.com is based on your reputation. The Outlook.com Smart Network Data Services (SNDS) gives you the data you need to understand and improve your reputation at Outlook.com. But just looking at the data isn't enough! Maintaining a good reputation is a lot of work. You should use this data to keep your mailing lists clean and to ......
https://postmaster.hotmail.com/snds/index

SNDS - FAQ - postmaster.hotmail.com
...That is, the command "RCPT TO:" requests Outlook.com's servers to respond with whether it will accept mail for example@hotmail.com, information which is invaluable to spammers trying to compile recipient lists for future spamming....
https://postmaster.hotmail.com/snds/FAQ.aspx