Microsoft Exchange Server 2003 Deployment Guide- P56:Your Exchange Server 2003 deployment plan should reflect your understanding of how Exchange and Microsoft Windows Server™ operating systems interoperate. It should encompass the relationships between Windows Server 2003 and Microsoft Windows® 2000 Server sites and domains, domain controllers, global catalog servers, and Exchange 2003 administrative and routing groups. | 551 Scenario Anonymous Mail Submission E-mail addresses are not resolved if the submission is anonymous. Therefore when an anonymous user who attempts to spoof forge an internal user s identity sends mail the return address does not resolve to its display name in the global address list GAL . Example Kim Akers is a legitimate internal user at Northwind Traders. Her display name in the GAL is Kim Akers and her e-mail address is kim@. To send mail Kim must be authenticated. Because she is authenticated the intended recipients of Kim s mail see that the sender is Kim Akers. In addition the properties of Kim Akers are displayed as her GAL entry. However if Ted Bremer attempts to forge Kim s address by using kim@ in the From line and then sending the mail to the Exchange 2003 server at Northwind Traders the e-mail address is not resolved to Kim s display name because Ted did not authenticate. Therefore when this e-mail message displays in Outlook the sender address appears as kim@ it does not resolve to Kim Akers as authenticated mail from Kim does. 552 Scenario Cross-Forest Mail Delivery Consider a company that spans two forests the Adatum forest and the Fabrikam forest. Both these forests are single-domains forests with domains of and respectively. To allow crossforest mail collaboration all users in the Adatum forest are represented as contacts in the Fabrikam forest s Active Directory. Likewise all users in the Fabrikam forest are represented as contacts in Adatum forest s Active Directory. If a user in the Adatum forest sends mail to Fabrikam forest and the mail is submitted over an anonymous connection the sender s address is not resolved despite the fact the sender exists as a contact in the Active Directory and in the Outlook GAL. This is because a user in the Adatum forest is not an authenticated user in Fabrikam forest. Example Kim Akers is a mail user in the Adatum forest her