Google Outbound Services Configuration Guide - Manual (Page 56)

60 Outbound Services Configuration Guide
Configure the new virtual server to listen on a unique port number
1. Right-click the new virtual server and select Properties.
2. On the General tab, click Advanced.
3. Highlight the IP Address and click Edit.
4. Change the TCP Port to 26 (or any other unused port).
All internal servers that need to communicate with this existing server will also
need to be reconfigured to use this alternate port number.
As an alternative, if the machine is multihomed (i.e. has more than one
network interface), you can configure the new virtual server to use a different
IP address rather than a different port. This is simpler and avoids potential
communication issues between this machine and the other machines in the
routing group. Consult your Exchange documentation for details on how to do
this.
5. Configure the new virtual server to allow other internal mail servers to relay
traffic through it.
Configure the smarthost for the SMTP virtual server to route traffic to the email
security service
1. In the lower right corner of the window, click Advanced.
2. Type in the appropriate smarthost hostname listed below in the field labeled
“Smart host”.
The appropriate smarthost is
outbounds[your system number].obsmtp.com
where [your system number] is your system number. To find what system to
use, see “Identify Your System” on page 13.
3. Click OK to close the Advanced dialog and OK to save the changes and close
the SMTP Virtual Server Properties.
Configure your firewall
If necessary, configure the firewall or router to allow outbound traffic on port 26 (or
whichever port was used) to ensure that traffic between the internal servers will
not be blocked. (If an alternate IP address was used, this step is skipped.)
Configure other mail servers
On other machines which need to send outbound mail by way of this new virtual
server, make the following configurations:
1. Right-click the Virtual Server and select Properties.
2. On the Delivery tab, click the Outbound Connections button.
3. Change the TCP port to 26 (or whatever port was chosen for the Inbound/
Outbound server settings above) and click OK.