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Chapter 5: Mail
Some simple and useful customizations you may need to make include the following:
• Typically,
mydestination lists the domains that appear in the email addresses of
local users; that is, the domains for which Postfix accepts and delivers mail. By
default, Postfix accepts mail destined for
$myhostname and localhost.$mydomain,
the host on which Postfix is running. You can specify that the system should
accept mail for your whole domain by adding
$mydomain to the list:
mydestination = $myhostname, localhost.$mydomain, $mydomain
• You can tell Postfix which hosts you want to allow to relay mail by setting the
mynetworks parameter. (If you set mynetworks, Postfix ignores the mynetworks_
style
parameter.) You can provide one or more IP addresses and/or use the net-
work/netmask notation (e.g.,
151.164.28.0/28). This parameter is useful when
you wish to provide relaying to hosts outside your network—for example, to
executives working at home, salesmen on the road, etc.
We will make some other changes to /etc/postfix/main.cf later in this chapter, to add
allow authentication and password encryption.
Testing Mail
With Debian’s configuration in place, you can receive and send email from your shell
account. The following is an example of two test messages sent by one of this book’s
authors. First, I used a Gmail account to send a mail message to a user account on
the server2.centralsoft.org