Specifies the user-visible e-mail account name through which the e-mail message is sent.
Long ID (LID):
The format of this string is implementation dependent. This property can be used by the client to determine which server to direct the mail to, but is optional and the value has no meaning to the server.
Provides property set definitions and references to related Exchange Server protocol specifications.
Specifies the properties and operations that are permissible for e-mail message objects.
Provides data type definitions.