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          Gets and sets the user name or ID used to authenticate the session. Syntax
          object.UserName [= value ] Remarks
          The UserName property is used to authenticate the current 
          session. If the message is being sent using SMTP, this property is 
          used to specify a user name when connecting to the mail server . If no 
          authentication is required, this property may be an empty string. Note 
          that some service providers may use terminology other than "username" 
          with their documentation; in that case, this property will always 
          specify the first of a pair of authentication tokens sent to the 
          server to identify the client. Data Type
          String See Also
          Password Property,
          ServerName Property,
          ServerPort Property,
          SendMessage Method
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