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Relay Email from Hosts/Domains/IP Addresses. Enter the IP
addresses, host names, or domain names that are allowed to relay email
through this Cobalt Qube 3 server. For more information, see "Email
relaying" on page 41.
A user cannot send outgoing email through this server unless the
IP address, host name or domain name of the machine from which they
they are connecting is entered in this field. Networks may be specified in
addition to IP addresses. For example, to allow relaying for a network
192.168.1.1 with subnet mask 255.255.0.0, specify the address
192.168.0.0.
Caution: Some users advise you to open relay to all com, edu, net
and other top-level domain addresses. However, doing so allows
!
hosts belonging to com, edu, net and others to relay email through
your Cobalt server; this relayed mail is known as spam mail.
Spam mail can appear as though it originated from your server and
as a result, others may blacklist your server as a known spam site. If
your server is blacklisted, many mail servers will not relay your
email and your customers will not receive any email messages.
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Note: By default, the domain name for the Qube 3 is allowed to
relay email.
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If you do not want to allow email to be sent through the Qube 3,
enter the domain name of the Qube 3 in the "Block Email From
Hosts/Domains" field. You will be able to download email but not
be able to send outgoing email messages through Qube 3.
For more information, see "Configuring the email settings" on
page 131.
The entries you add to this field serve as part of a pattern match against
the email that the client is sending. As a result, some handy shortcuts are
possible. If you have a number of hosts in the same network block, you
can, as a shortcut, simply enter the number of the network block.
For example, specifying a network such as 192.168.1.0 in the "Relay
email from these hosts/domains" field trusts all IP addresses from
192.168.1.0 through 192.168.1.254.
Cobalt Qube 3 User Manual
Email Services
133
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