Using a Single Exchange Server in Its Default Configuration

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Tópico modificado em: 2005-05-20

This scenario describes how Exchange delivers Internet mail in its default configuration.

Basic Configuration

In this scenario, you need the following:

  • A persistent connection to the Internet.
  • A Domain Name System (DNS) server that can resolve external domain names, and a DNS server on the Internet with a mail exchanger (MX) record that points to your Exchange server.
  • A recipient policy that is configured with the SMTP mail domain for which you want the Exchange server to receive mail.

Inbound Internet Mail

When using a single Exchange server in its default configuration, incoming Internet mail flows into the Exchange server in the following manner:

  1. The remote SMTP server queries DNS to resolve the MX record for your mail domain and to obtain the IP address of your Exchange server.
  2. The remote SMTP server then connects to your Exchange server on port 25, which your default SMTP virtual server accepts.
  3. Your default SMTP server verifies that the domain on the incoming message matches an SMTP domain in its recipient policies.
  4. Your default SMTP server then accepts the message and delivers it to the recipient.

Outbound Internet Mail

When using a single Exchange server in its default configuration, outgoing Internet mail flows out of the Exchange server in the following manner:

  1. An internal user sends a message with an external user as a recipient.
  2. From its recipient policy information, the default SMTP virtual server determines that the message is destined for a remote domain.
  3. Because the internal user is authenticated, the default SMTP virtual server accepts the message for outbound delivery. Remember, the default SMTP virtual server allows relaying for authenticated users only.
  4. The default SMTP virtual server queries DNS to resolve the MX record of the remote mail server to the IP address of this server.
  5. The default SMTP virtual server connects to the remote SMTP server on port 25 and initiates delivery.