In the heart of email lies communication. It was designed as a fast and efficient way for communication between two points. Email made data sharing easy and it also helped us to archive shared information. But every shine has its dark side. For email, spamming is one of those dark sides. Top ESP’s these days are fighting with spammers. Many efficient and intelligent codes have been written worldwide just to filter spams from hams.
We can classify spam codes on the basis of source as follows,