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HOW TO: Configure the SMTP Virtual Server for Message Delivery
Article ID: 303734 - View products that this article applies to.
This article was previously published under Q303734
After a connection has been opened and the receiving server has acknowledged that it is ready to receive data, messages can be transmitted for delivery. This step-by-step article describes how to deliver messages.
Configure Retry Tries and IntervalsIf a message cannot be delivered on the first try, the Microsoft Simple Mail Transport Protocol (SMTP) Service sends it again from the Queue directory after a specified time. You can set the interval between delivery tries and also designate the number of times to try to deliver a message. After the limit is reached, the non-delivery report (NDR) and messages are sent to the Badmail directory.
You can use these settings to increase your server output speed, but these settings affect outgoing messages only and have no effect on the rate at which other servers process incoming messages. To configure these settings, follow these steps:
Set the Message Hop CountWhen a message is delivered, it may be routed to a number of servers before it reaches its final destination. You can designate how many servers the message is permitted to pass through. This is named the hop count. To set the message hop count, follow these steps:
Set the Masquerade DomainThe masquerade domain replaces any local domain name that is used in any Mail From lines in the protocol. The replacement occurs on the first hop only.
Set a Fully Qualified Domain NameAt startup, the name that is designated on the Network Identification tab of the System Properties dialog box is automatically used for the fully qualified domain name (FQDN). If you change the name (either manually or by joining a Microsoft Windows 2000 domain), the new name is automatically used for the FQDN the next time the computer is restarted. You do not have to perform any action to update the FQDN for the virtual server.
To override the automatic use of the computer and domain names on the Network Identification tab, change the FQDN in the Advanced Delivery dialog box (this is accessed through the Delivery tab). The Microsoft SMTP Service can then use the designated name instead of the name that is specified on the Network Identification tab. To set the FQDN, follow these steps:
Configure a Smart HostYou can route all outgoing messages for remote domains through a smart host instead of sending them directly to the domain. This permits you to route messages over a connection that may be more direct or less costly than other routes. The smart host is similar to the route domain option for remote domains. The difference is that after a smart host is designated, all outgoing messages are routed to that server. With a route domain, only messages for the remote domain are routed to a specific server.
If you set up a smart host, you can still designate a different route for a remote domain. The route domain setting overrides the smart host setting. To set up a smart host, follow these steps:
Enable a Reverse DNS LookupIf you select this option, Microsoft SMTP Service tries to verify that the IP address of the client matches the host or domain that is submitted by the client in the EHLO or HELO command.
NOTE: Because this feature verifies addresses for all incoming messages, its use can affect Microsoft SMTP Service performance. Clear the check box to disable the feature.
If the reverse DNS lookup is successful, the Received header remains intact. If the verification is unsuccessful, "unverified" appears after the IP address in the Received header of the message. To enable reverse DNS lookup, follow these steps: