Simple Mail Transfer Protocol (SMTP) is the
Internet standard for transporting and delivering electronic
messages. Based on specifications in Request for Comments (RFC) 821
and RFC 822, Microsoft SMTP Service is included in the Windows 2000
Microsoft Exchange 2000 Server expands Microsoft SMTP Service,
enhancing the basic delivery functions of the protocol without
compromising its compatability with other messaging systems.
Exchange gives administrators greater control over the routing and
delivery of messages, and provides secure access and channels for
managing the service.
If you use Microsoft SMTP Service on a
computer prior to installing Exchange 2000, any configurations you
make in the operating system will be lost. Also, messages still in
the Pickup or Queue directories won't be delivered. In Windows
2000, SMTP uses the subdirectories in the
<root>\Inetpub\mailroot directory. While these folders
haven't been deleted, SMTP will now use the
<root>\Exchsrvr\mailroot directory. More...
Multiple virtual servers can be helpful in
certain situations. If you have different groups of users with
varying security requirements or message-size needs. You may want
to create additional virtual servers.
Additional virtual servers are also helpful for managing different
types of e-mail. For example, in a mail gateway, one dedicated virtual
server can handle Internet e-mail, while another handles internal