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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1
Domains in the SMTP service are different from DNS domains and Windows domains. The SMTP service domains are used for organizing messages for delivery.
The Simple Mail Transfer Protocol (SMTP) virtual server has at least one ___domain--the default local ___domain. You can add more domains and configure them to be local or remote. You can delete any ___domain except the default ___domain.
Local Domains
A local ___domain is a DNS ___domain that is serviced by the local SMTP server. Any message with a local ___domain name that arrives at an SMTP server must be delivered locally to a Drop directory or returned to the sender with a non-delivery report (NDR). Local domains are sometimes referred to as service domains or supported domains. E-mail addresses with local ___domain names are often referred to as local addresses.
If the ___domain is local, you can designate it as default or alias. There is one default ___domain. It is used to stamp message headers that lack a ___domain specification. An alias ___domain is an alias of the default ___domain. If you add a ___domain and assign it as the new default, the previous default changes to an alias ___domain.
Remote Domains
Domains that are not local are known as remote or nonlocal domains, and e-mail addresses with remote ___domain names are referred to as nonlocal addresses. The SMTP service looks up remote domains in DNS.
If you want to set unique delivery requirements for a specific remote ___domain, you can add a remote ___domain and configure it accordingly. For example, you can add a remote ___domain and require that the SMTP service always use Transport Layer Security (TLS) encryption in sessions with that ___domain. Or, you can change the routing so that messages sent to one remote ___domain are routed to another remote ___domain. Use the Domain Properties dialog box to configure domains.
This section includes the following information:
Creating SMTP Domains: Describes how to create alias and remote domains.
Deleting SMTP Domains: Describes how to delete an SMTP ___domain.
Configuring Local SMTP Domains: Introduces the concept of configuring local domains.
Configuring Remote Domains: Introduces the concept of configuring remote domains.