There are two identifying features for an SMTP virtual server:
the display name and the IP
address/TCP port combination. Setup assigns a display
name for the default SMTP virtual server. You can keep the name
(Default SMTP Virtual Server) or change it. You can also select the
IP address that will be associated with this SMTP virtual
server.
Right-click the virtual server, click Rename, and then
type in the new name.
Right-click the SMTP virtual server again, and then click
Properties.
On the General tab, use the IP address drop-down
menu to select an IP address for the virtual server. The SMTP
virtual server can respond to connection requests for all IP
addresses configured on the computer.
To identify the TCP port associated with each IP address
configured for the virtual server, in Advanced, click
Add or Edit.
Port 25 is the SMTP standard TCP port
and is recommended. More than one virtual server can use Port 25,
provided they are associated with different IP addresses. The IP
address/TCP port combinations must be unique on all virtual servers
for clients to connect successfully.
To configure new IP address/TCP port combinations or edit
existing ones, in Identification, select an IP address from
the drop-down menu, and type in a TCP port number to associate with
it.
Tip When you change an SMTP
virtual server's configuration, you may want to use the Pause command. Pausing a virtual server prevents
new client connections but enables Exchange to continue processing
existing client connections and delivering queued messages.
Any time you make changes to a virtual server,
you may need to allow a few minutes for your changes to take
effect. The metabase
update service needs time to replicate your changes.