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60  Installation for Microsoft Exchange 2007 & 2010 Getting Started Guide
Post-Installation Wizard
1. Click Next in the welcome page.
Screenshot 52 - DNS Server settings
2. In the DNS Server dialog, select:
 Use the same DNS server used by this server - Select this
option to use the same DNS server that is used by the operating
system where GFI MailEssentials is installed.
 Use an alternate DNS server - Select this option to specify a
custom DNS server IP address.
Click Test DNS Server to test connection with the specified DNS
server. If test is unsuccessful, specify another DNS server. Click Next
to continue.