Got this spam mail that looks as if its from my other email account (Yahoo Mail).
Further inspect on the header reveals that the mail is from hotmail_631448ecb4add0e [at] hotmail.com. And the mail server is actually from the IP 18.104.22.168.
Why Hotmail SmartScreen not doing its job
SmartScreen should have filtered the email content, based on EITHER one of the following criteria, that can be implemented by checking just the email header.
1. The email content is obviously spam content. Nuff said.
2. The sender is obviously from a "anonymous" email that pretends to be another email.
3. The IP (22.214.171.124) of the mail server is OBVIOUSLY hosted on a spam source. This can be easily detected by cross-check with one of the spam database out there. For example http://www.dnsbl.info/.
These are simple methods to provide minimal layers protection for Hotmail users.
(Notice I haven't even go into advanced SPAM fighting techniques like using DMARC)
SmartScreen team should learn from Gmail, and Facebook. Gmail did VERY well in filtering spam mails, and automatically categories emails for users.