(STEVEN) employs an advance email checking system that validates the sender of the email rather than relying on content to determine if it is spam or not. (STEVEN) does this by automatically replying to all emails it retrieves with a brief message asking the sender to validate the message they sent you. The sender validates it simply by hitting reply and send. This is a once only procedure per sender as once they have been validated it will never need to validate them again. People that send spam very rarely have a valid email address and hence (STEVEN) detects this and determines the email as SPAM. For mailing list you have subscribed to you will have to manually white list these senders once. (STEVEN) will also delete attachments automatically that can be considered harmful to your system. This is an optional setting and you can control which attachments to delete or warn the user about.