Product manual

GFI MailEssentials 3 Installation | 30
3. Select Forward all mail to smart host and specify the IP address of the server managing emails in
this domain. IP address must be enclosed in square brackets, for example, [123.123.123.123], to
exclude them from all DNS lookup attempts.
4. Click OK to finalize your configuration.
Step 4: Secure your SMTP email-relay server
If unsecured, your mail relay server can be exploited and used as an open relay for spam. To prevent
this, it is recommended that you specify which mail servers can route emails through this mail relay
server (for example, allow only specific servers to use this email relaying setup). To achieve this:
1. Go to Start > Control Panel > Administrative Tools >Internet Information Services (IIS) Manager.
2. In the left pane, expand the respective server node. Right click on Default SMTP Virtual Server and
select Properties.
3. From the Access tab, select Relay.
4. Select Only the list below and click Add.
5. Specify IP(s) of the internal mail server(s) that are allowed to route emails through your mail relay
server. You can specify:
Single computers - Authorize one specific machine to relay email through this server. Use the
DNS Lookup button to lookup an IP address for a specific host.
Group of computers - Authorize specific computer(s) to relay emails through this server.
Domain - Allow all computers in a specific domain to relay emails through this server.
NOTE
The Domain option adds a processing overhead that can degrade SMTP service
performance. This is due to the reverse DNS lookup processes triggered on all IP
addresses (within that domain) that try to route emails through this relay server.
Step 5: Enable your mail server to route emails via GFI MailEssentials
Microsoft
®
Exchange Server 2003
Set up SMTP connectors that forward all emails to GFI MailEssentials.
1. Start Exchange System Manager.
2. Right-click Connectors, click New > SMTP Connector and specify a connector name.
3. Select Forward all mail through this connector to the following smart host, and specify the IP
of your GFI MailEssentials relay server within square brackets, for example,
[123.123.1.123].
4. Click Add and select the GFI MailEssentials email relay server.
5. Click OK.
6. Go to Address Space tab.
7. Click Add, select SMTP and click OK.