|I am very much keen to do some R&D on the administering Exchange so I have installed Exchange 2010, everybody can get the mail, and entire thing works very well. It needs spam blocker and someone told me to make use of the Spamhaus ZEN for this and also it is available free. Unsolicited e-mail called as spam is very difficult predicament. Unlike viruses, spam mail doesn't have clear signature. As anyone can send you e-mail that you don't want to receive so deciding which e-mail you unquestionably would not want to accept is difficult. Different anti-spam packages are present. Alternatively, join them into mail systems is not insignificant. They have comprised so numerous options with purpose of help you defend spam other than be able to in addition cause much trouble and raise "where is my mail" type help desk calls. Any help will be appreciated.