Forward To: When this option is selected, the SMTP module connects to the specified forwarding mail server (also called a smart host) and sends all queued messages to that server. Since the forwarding mail server is usually "close" to your server, messages leave your system quickly. But this method can cause additional delays in message delivery, since messages are queued on the forwarding server and those queues can be processed slowly. This method is recommended when your server is connected to the Internet using a slow link, or when you use a dial-up link and you want messages to leave your server as soon as possible to keep the connection time short.
Select the Forward to option and specify the name or the IP address of the forwarding server. The SMTP module will forward all outgoing messages to that mail server for delivery.
Note: the name of the forwarding mail server should be the name of the real computer (as specified in an A-type DNS record), not a mail domain (MX-type) name. While your provider domain name can be provider.com, the name of the provider mail server can be something like mail.provider.com. Consult with your provider to get the exact name of the forwarding mail server you can use.
Note: you can specify the IP address of the forwarding server instead of its name. You can also specify several IP addresses, separated with the comma (,) symbol. If an SMTP connection to the first specified address cannot be established, the SMTP module will try the next specified address.
Note: when configuring a Cluster Backend Server, you can specify the asterisk (*) symbol in the Forward To setting. In this case, all Cluster Frontends (specified on the Cluster Settings page) will be used as the forwarding mail servers.
Note: when a recipient domain name is specified as an IP address (as in email@example.com), the SMTP module delivers messages directly to the host with the IP address 220.127.116.11, even if the Forward to option is selected. You may use this feature for message exchange between several mail servers on a LAN that does not have its own Domain Name Server.
Auth Name: The forwarding mail server should be configured to enable relaying from your server to any other server on the Internet. Some forwarding mail servers may require your server to use the AUTH command with a valid name and password parameters before transferring messages that need to be relayed. In this case you should enter the AUTH login name and password in the AUTH fields.
This type of configuration is used when your server has a "dynamic IP address", and receives mail from the same forwarding server using the ATRN method. Usually the username and password used for mail forwarding are the same as the username and password used for ATRN receiving.