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• Preventing the Exchange 2000 Server from Relaying E-mail Messages
  To prevent the Exchange 2000 server from relaying e-mail messages:
  1.Start Exchange System Manager.
  2.Expand the organization_name object, and then expand the Servers node.
  3.Expand the server_name object of the server on which you want to prevent mail relay, and then expand the Protocols node.
  4.Expand the SMTP node, right-click the virtual SMTP server on which you want to prevent mail relay, and then click Properties.
  Click the Access tab, and then click Relay.
  5.In the Relay Restriction dialog box, several options are available. The Only the list below option is turned on. By default, the list below this option is empty. The Allow all computers which successfully authenticate to relay, regardless of the list above option is also turned on. By default, this permits users and computers that can authenticate with the server to relay through the server. This option permits the Exchange 2000 server to relay mail from your internal network clients. Note that if you allow only anonymous access, the server cannot authenticate users or computers.
  6.Click Add. You can permit a single computer, a group of computers, or an whole domain to relay through the server by making the appropriate selection in the Computer dialog box.
  
  Allowing access by IP address or domain name is helpful for users who do not authenticate with the Exchange server (for example, in an Internet service provider [ISP] implementation).
  
  Click Cancel if you do not want to make any changes.
  7.In the Relay Restrictions dialog box, click OK.
  8.Click Apply, and then click OK in the Default SMTP Virtual Server Properties dialog box.
  NOTE: By default, Exchange 2000 server is not open for Internet relay.
  

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