Barracuda Networks 4 Guida di Installazione Pagina 119

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Outbound 119
Adding a Relay Server
Advanced > Relay allows you to add relay servers or 'smart hosts' for certain domains. Adding a relay
server is necessary if you want to redirect messages for certain domains to another relay server or to
another mail server in your network
To add a relay server:
1. In the Relay Server Configuration field, enter the relay server domain name and click Add
Domain
.
2. Enter the relay server’s IP address and destination port.
3. Specify whether you want to use MX records.
4. Click Save Changes.
5. Enter a valid e-mail address in the provided field, and click Test.
6. The Barracuda Spam Firewall sends an e-mail to the relay server.
7. Check the relay server to verify the test message was received. If the message is not delivered,
verify the relay server information you just entered.
This page also lets you specify a single mail relay server, as follows:
1. Enter an asterisk (*) as the domain name and click Add Domain.
2. Remove all other entries from the domain name list by clicking the trash can icon next to each
one.
The asterisk wildcard domain causes all outbound e-mails forwarded to the Barracuda Spam Firewall
to be sent to a single mail server to another relay server specified on the
Advanced > Relay.
Table 8.8:
Setting Description
Rate Control Specifies the rate threshold for the following:
Maximum number of connections allowed from the same IP address in a
half-hour timeframe. This setting takes affect when over 5 unique IP
addresses are connected to the Barracuda Spam Firewall.
Maximum SMTP sessions allowed from the same e-mail address. This
setting takes affect after 5 unique e-mail addresses have been sent
through the system.
When the number of connections or SMTP sessions goes over the
specified rate, the Barracuda Spam Firewall blocks further outgoing
messages from the sending IP address or SMTP session.
Rate Control Exclude
IP/Range
The IP address range you wish to exclude from rate control. To enter a
single IP address (instead of a range), enter a netmask of
255.255.255.255.
Rate Control Exclude
Sender Email Address
The sending e-mail addresses (one per line) that should not be subject to
rate control.
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