X-Message-Delivery in Hotmail Messages
问题 Recently I stared deciphering the hotmail inbox/junk folder placement. After long searching I found out that Hotmail/Outlook is using their X-Message-Delivery tag they input in each mail, to determine alot of things. If you go to source of an e-mail you can see an X-Message-Delivery similar to this : Vj0xLjE7dXM9MDtsPTE7YT0wO0Q9MjtHRD0yO1NDTD00 which if you BASE64-Decode it you get V=1.1;us=0;l=1;a=0;D=2;GD=2;SCL=4 Based upon my research, I found out that following things are causing a