Using a Network Service Provider to Send and Receive Mail

 

If your Exchange server uses a dial-up connection to send and retrieve Internet mail, you must have a dial-up account to your network service provider. Furthermore, you must configure the Windows 2000 or Windows Server 2003 Routing and Remote Access Service (RRAS) to dial and authenticate with the network service provider on demand. For more information about configuring RRAS, see the Microsoft Windows 2000 or Windows Server 2003 Help.

If you want to use a network service provider's SMTP server as a smart host (also known as a relay server) to deliver outbound e-mail messages, you can verify addresses on outgoing mail when you send it. Mail can be sent on demand, or you can set up a specific delivery schedule. To configure these settings, use the Delivery options tab in the SMTP connector's properties.

To retrieve e-mail messages from the smart host, on the Advanced tab of the SMTP connector's properties, click Request ETRN/TURN when sending messages. As mentioned earlier, ETRN is an ESMTP command that is sent by an SMTP server to request that another server send any e-mail messages it has. TURN is an SMTP command that allows the client and server to switch roles and send mail in the reverse direction without having to establish a new connection. This ability to switch during an SMTP session is useful because you can send mail and then issue the TURN command to receive mail without having to re-establish a new connection. Additional times can be specified for retrieval purposes only.

If you want to send e-mail messages directly to remote domains without using the network service provider's e-mail server as a smart host, you can configure the SMTP connector to use DNS to send mail. However, you can still retrieve mail from your network service provider. To retrieve mail from your network service provider, select Request ETRN/TURN from different server on the Advanced tab of the SMTP connector's properties. If you configure the SMTP connector in this way, you are required to set up a schedule for retrieval.