In the Background Services table on the Local
Services tab, click SMTP (Postfix).
The Postfix Status page is displayed.
On the sidebar, click Change Postfix Configuration.
The Postfix Configuration page is
displayed.
Change the text boxes in the Settings table as required.
The text boxes are:
Name of Mail Server: Specify the fully qualified internet
hostname of the mail server. For example,
myhost.example.org.
Domain: Specify the local internet domain name to which this
server belongs. For example, example.org.
Originating Address: Specify the domain name that Postfix should
append to unqualified addresses. The value may be specified as
$myhostname or
$mydomain to use the values specified in the
Name of Mail Server and
Domain text boxes.
Destination Address: Specify a list of email addresses that
Postfix should deliver messages for locally. Values in the list should
be separated by a comma and followed by a single space. Again,
$myhostname or
$mydomain can be used as in the
Originating Address text box. For example:
For a workstation or gateway, use: $myhostname,
localhost.$mydomain
For a mailserver for an entire domain (for example, a mail hub),
use $myhostname, localhost.$mydomain,
$mydomain
For a mail server that uses a virtual host interface, use
$myhostname
Mail Relay: If the machine is on an open network, then you must
specify what client IP addresses are authorized to relay their mail
through that machine. The default setting includes all class A, B or C
networks that the machine is attached to. Often, that gives relay
permission to too many clients, so specifying a more restrictive list is
recommended.
Gateway: The SMTP relay to use for mail delivery. If the machine
is behind a firewall, or if the network has a dedicated mail gateway,
specify the host to relay through. For example:
To use the server(s) in your domain's DNS MX records, enter
$mydomain
To use the server(s) associated with a host's MX records, enter
mail.$mydomain
To use a specific host without paying attention to MX records,
enter [mail.$mydomain]
Click Save.
Re-start the Postfix service for the changes to take effect.