How to configure user permissions to relay e-mail message through SMTP Service?

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You need to configure the user permissions to relay e-mail messages through the SMTP service. Do the following steps:
  1. Click Start, click Run, type inetmgr or open Internet Information Manager from Control Panel > Administrative Tools, and then click OK.
  2. Expand ComputerName, and then right-click a valid SMTP virtual server.
    Note The placeholder ComputerName represents the name of the local computer.
  3. Click Properties. On the Security tab, add the user account as an Operator, which you want to relay e-mail message through SMTP Service.
  4. Close all dialog boxes, and then restart the SMTP service
  5. Now try to send the email. Hope now the e-mail messages will be relayed through the SMTP service