JSI Tip 6757. How do I set up a Simple Mail Transfer Protocol (SMTP) virtual server on a Windows Server 2003-based computer?

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Microsoft Knowledge Base article Q816121 contains:

SUMMARY

This step-by-step article describes how to set up a Simple Mail Transfer Protocol (SMTP) virtual server on a Windows Server 2003-based computer.

Microsoft SMTP Service uses the Internet-standard SMTP to transport and deliver mail messages. Microsoft SMTP Service does not support the use of individual mailboxes. The service places incoming messages in a Drop folder or forwards them to other SMTP servers (if the message is addressed to a remote domain). This feature allows Microsoft SMTP Service to be used as a mail receiver for other programs.

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Install Microsoft Internet Information Services (IIS) and Microsoft SMTP Service

Because Microsoft SMTP Service is a component of Microsoft Internet Information Services (IIS), you must install IIS to use Microsoft SMTP Service. To install IIS and Microsoft SMTP service, follow these steps:
  1. Click Start, point to Control Panel, and then click Add or Remove Programs.
  2. Click Add/Remove Windows Components.
  3. In the Windows Components Wizard, click Internet Information Services (IIS), and then click Details.
  4. Click to select the following check boxes:
    • Common Files
    • Internet Services Manager (HTML)
    • SMTP Service
    • World Wide Web Server
  5. Click to select any other components that you want.
  6. Click OK two times, click Next, and then click Finish to close the Windows Components Wizard.
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Configure the SMTP Virtual Server

When you install Microsoft SMTP Service, a default SMTP virtual server is created to handle basic mail delivery functions. The SMTP virtual server is automatically configured with default settings that enable it to accept local client computer connections and to process messages. You can either accept the default settings or change the SMTP virtual server configuration. You can configure the SMTP virtual server to meet your messaging requirements. This article describes basic configuration and security settings that you may want to consider using.

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Assign an IP Address

To assign an IP address to your SMTP virtual server, follow these steps:
  1. Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
  2. Right-click Default SMTP Virtual Server, and then click Properties.
  3. Click the General tab.
    • If you want the SMTP virtual server to respond to connection requests for all IP addresses that are configured on the computer, click to select (All Unassigned) in the IP address box. (This is the default setting.)
    • If you want to assign a specific IP address to the SMTP virtual server, click the IP address that you want to use in the IP address box.
    • If you want to assign additional IP addresses to the virtual server, click Advanced, click Add, specify the IP address and the Transmission Control Protocol (TCP) port number, and then click OK three times.

      Note The default TCP port is 25.
  4. Click OK.
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Configure the Default Domain

SMTP virtual servers must have one local default domain. The default domain is used to stamp messages from addresses that do not contain a domain. By default, the name that you specify on the Network Identification tab of the System tool in Control Panel is used as the default domain name.

All incoming mail messages that are designated for the default domain are placed in the Drop folder. By default, the Drop folder is located in the Inetpub\Mailroot folder.

To change the location of the Drop folder, follow these steps:
  1. Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
  2. Double-click Default SMTP Virtual Server, and then click Domains.
  3. In the right pane, right-click the default domain, and then click Properties.
  4. Click Browse, locate and select a folder that you want to use for your Drop folder, and then click OK two times.

    Note You must put the Drop folder in a folder on the local computer where Microsoft SMTP Service is installed.
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Enable Transaction Logging

Log files keep a record of all the messages that are received and sent on your computer. To turn on logging, follow these steps:
  1. Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
  2. Right-click Default SMTP Virtual Server, and then click Properties.
  3. Click the General tab, and then click to select the Enable logging check box.
  4. In the Active log format box, click the log format that you want to record information in. The default log format is W3C Extended Log File Format.
  5. Click Properties.
  6. Specify the settings that you want to use. You can specify settings to include the logging time period and the location and name of the log file.
  7. Click OK two times.
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Set Relay Restrictions

By default, all computers are denied relay access. Microsoft SMTP Service does not allow computers to relay unwanted mail through the virtual server. All computers are denied relay access except those that meet the authentication requirements that are specified in the Authentication box on the Access tab. If your virtual server is on the Internet, Microsoft recommends that you do not grant relay access. If you do, unsolicited mail may be propagated. To grant or deny permissions to relay messages through the SMTP virtual server, follow these steps:
  1. Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
  2. Right-click Default SMTP Virtual Server, and then click Properties.
  3. Click the Access tab.
  4. Under Relay restrictions, click Relay, and then do one of the following:
    • Click Only the list below.
    • Click All except the list below.
  5. Click Add.
  6. Click the settings that you want to use, add the computers, the group of computers, or the domain that you want to specify as exceptions to the access setting that you selected in step 4, and then click OK three times.
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Set Up a Smart Host

If you want to designate another SMTP server to handle all outgoing messages, you can set up a smart host to perform this task. After you set up the smart host, all outgoing messages that are designated for remote domains are routed through it. To configure a smart host, follow these steps:
  1. Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
  2. Right-click Default SMTP Virtual Server, and then click Properties.
  3. Click the Delivery tab, and then click Advanced.
  4. In the Smart host box, type either the fully qualified domain name (FQDN) or the IP address of the smart host server.

    If you type an IP address, enclose the address in brackets (for example, \[192.168.188.228\]). This may improve performance because Microsoft SMTP Service does not perform name resolution.
  5. If you want Microsoft SMTP Service to try to deliver the remote messages directly before it forwards them to the smart host, click to select the Try to direct delivery before sending to smart host check box. (By default, this check box is not selected.)
  6. Click OK two times.
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Troubleshoot

Issue: Messages are not sent to the Drop folder. This issue may occur because of either of the following conditions:
  • The path of the Drop folder is incorrect.

    To troubleshoot this issue, follow these steps:
    1. Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
    2. Double-click Default SMTP Virtual Server, and then click Domains.
    3. In the right pane, right-click the default domain, and then click Properties.
    4. In the Drop directory box, verify that the path of the Drop folder is valid.
  • Either the Drop folder or the hard disk where the Drop folder is located is full.

    To troubleshoot this issue, free hard disk space in either the Drop folder or on the hard disk where the Drop folder is located. For additional information about how to troubleshoot Microsoft SMTP Service, click the following article number to view the article in the Microsoft Knowledge Base:

    323358 HOW TO: Troubleshoot a Web Server in Windows Server 2003



    For additional information about how to test Microsoft SMTP Service, click the following article numbers to view the articles in the Microsoft Knowledge Base:

    323350 HOW TO: Test SMTP Services Manually in Windows Server 2003

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REFERENCES

For additional information about how to set SMTP security options, click the following article numbers to view the articles in the Microsoft Knowledge Base:

324285 HOW TO: Set SMTP Security Options in Windows Server 2003

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