There are two records that can be used to identify and verify a computer in a TCP/IP network. The mail exchanger (MX) record identifies the host and domain name associated with the computer. It uses the fully qualified domain name (FQDN) for the domain name. The address (A) record identifies the IP address for the computer. When both records are used, name resolution occurs faster.
For Microsoft SMTP Service to process MX records, an FQDN must be designated. An FQDN is used by DNS to identify the host server for a domain. The syntax is host.domain. For example, CompanyA.com may have several host servers, one of which is named Server01. The FQDN for the server would be Server01.CompanyA.com.
There are two options for specifying an FQDN. You can use the name specified on the Network Identification tab of the System Properties (in Control Panel), or you can specify a unique FQDN for the SMTP virtual server you are configuring.
At startup, the name designated on the Network Identification tab of the System Properties is automatically used for the FQDN. If you change the name (either manually or by joining a domain), the new name is automatically used for the FQDN the next time the computer is started. No action is required to update the FQDN for the SMTP virtual server.
To override the automatic use of the computer and domain names on the Network Identification tab, change the FQDN on the Delivery tab. Microsoft SMTP Service can then use the designated name instead of the one specified on the Network Identification tab.
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