Probing into Network Security Schemes for Anti-Spamming Mails

Describes the principle of mail protocol , analyses the all ways used in spamming mails, explains the main reasons what cause anti-spamming mails in popular mail server: Sendmail,Qmail,LotusDomino,Exchange. It gives the schemes for anti-spamming mails for 4 different mail server systems. All scheme given in the paper are effective in our practical system.