Anti-spam settings
What is spam?
                
            What should I do if I encounter spam?
                
            What is a blacklist, how to set it up?
                
            What is a whitelist, how to set it up?
                
            How to prevent spam?
                
            I received a spam mail and the sender is myself. What happened?
                
            How do I know who the real sender of spam is?
                
            Why is my account blocked?
                
            How to report the spam you received?
                
            What should I do if there is a mail in the spam folfer which is not a spam?