Do you offer any additional capabilities if I use Microsoft Exchange Server?
Only applicable if you use Microsoft Exchange server (Note: Exchange Server is not required to use our service). A "Dictionary" or NDR (Non-Delivery Report) attack is a sequence of spam messages that attempts delivery to every possible recipient name on a server. Microsoft Exchange attempts to protect against "Dictionary" attacks by accepting messages for all recipients rather than rejecting invalid recipients and letting a spam sender know which accounts are valid. Unfortunately, this often leads to very high Exchange server CPU loads because the server still attempts to send one or more non-delivery notification for every invalid recipient.
Our Spam Firewall MS Exchange Accelerator uses the LDAP (Lightweight Directory Access Protocol) service built into Exchange to verify recipients before delivering messages to the MS Exchange server and consuming valuable resources. This prevents NDR attacks while not effecting your Exchange server's load.
