Protecting Exchange against Spam
The first thing to consider when implementing an anti-spam package is where to place your anti-spam service. It can be installed as a mail relay (or on your mail relay if you already have one) on a dedicated server or as part of the Firewall services. It can also be installed on your Exchange server. Catching spam mail before it reaches your Exchange server seems like a good idea at first because it reduces the load on your servers in terms of CPU and database size. However, you would need to train your help desk personnel to fetch quarantined items from the anti-spam server. No anti-spam package can guarantee no false positives, that is e-mails you want to receive that are quarantined by the anti-spam server. This means that every time someone will not be receiving a promised e-mail from he or she will have grounds for calling up your help desk people asking for them to look for mail items that the anti-spam package stopped. For small and medium businesses this might not be an option....