You are the network administrator for Toys World, Ltd. The network consists of a single DNS domain named toysworld.com. You replace a UNIX server with a Windows Server 2003 computer named Srv1. Srv1 is the DNS server and Start of Authority (SOA) for toysworld.com. A UNIX server named Srv2 is the mail server for toysworld.com. You receive reports that Internet users cannot send e-mail to the toysworld.com domain. You need to ensure that Internet users can send e-mail to the toysworld.com domain. What should you do?