Supporting Messaging Clients

Create Additional SMTP Virtual Servers

In most cases you should only need one SMTP virtual server. However, if you are hosting multiple domains and want to have more than one default domain, for example, you can create multiple SMTP virtual servers. To an end user, each SMTP virtual server appears as a separate server with a unique IP address/TCP port combination.

To create a new SMTP virtual server:

Note   By default the assigned IP address is (All Unassigned), which means the virtual server will use all available IP addresses not already used by the selected TCP port. This includes 127.0.0.1, the default IP address for the local host.

  1. Start System Manager
    On the Start menu, point to Programs, point to Microsoft Exchange, and then click System Manager.
  2. Navigate to SMTP.
    1. Servers
    2. Server
    3. Protocols
    4. SMTP
  3. Right-click SMTP, point to New, then click SMTP Virtual Server.
  4. Complete the New SMTP Virtual Server Wizard.

    When you select an IP address, remember that the IP address/TCP port combination must be unique on every SMTP virtual server. The recommended TCP port is 25, the SMTP standard TCP port. More than one virtual server can use the same TCP port, provided they are configured with different IP addresses.

    Note   If the SMTP virtual server will be using a new IP address, you will have to first configure that new IP address before it can be used by Exchange. This is done in Windows 2000, by binding the new IP address with the corresponding network adapter. On the Start menu, click Settings, and then click Network and Dial-Up Connections. See your Windows 2000 documentation for more information.

  5. If the default startup setting for SMTP Service is set to Automatic, the new SMTP virtual server will start on its own. If the virtual server doesn't start, it may be because you selected an IP address/TCP port combination that is already in use.

    Tip   Be sure to allow enough time for Exchange to read and accept the settings on your new virtual server. Even if the server is configured correctly, it could take a few minutes for the information to replicate to the metabase. If the metabase update service has been disabled, new virtual servers cannot be added.

  6. Configure the new SMTP virtual server.

Note   If you do configure an IP address/TCP port combination that is already in use, a pop-up window will alert you. Select a TCP port that isn't being used by another virtual server on that IP address.

Related Topics

Configure an SMTP Virtual Server Change the Default Startup Setting