Using Sendmail for a Local Network in Software

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Using Sendmail for a Local Network
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Red Hat initially configures Sendmail to work only on the system it is running on, localhost. To use Sendmail to send messages to other hosts on a local network, you need to change and add settings in the sendmail.mc and /etc/mail/access files. A simple network configuration would have Sendmail running on each host, handling both mail sent between users on that host and to send and receive mail to and from users on other hosts. For each Sendmail server configuration, you would make the changes described in 7. Alternatively, you could set up a central mail server to handle all the mail on your network. Mail clients on various hosts could send their messages to the central mail server which would then relay them out to the larger network or Internet. Mail could then be received at the central mail server, where clients could later retrieve it. There are several ways to set up a central mail server. One of the simplest is to run a central mail server on your gateway host, and then have nullclient versions of the Sendmail server running on localhosts. Any mail sent from localhosts would be automatically forwarded to the central mail server. Received mail could only be delivered to the central server, usually to a POP or IMAP server also running on the central server's host. Users could then access the POP server to retrieve their mail. For a centralized configuration, it would make sense to treat users as having their network domain as their address, rather than separate hosts in their network. So the user cece on rabbit.mytrek.com would have the mail address cece@mytrek.com, not cece@rabbit.mytrek.com. Users could have the same name as those on their respective hosts, but corresponding users would be set up on the gateway host to handle received mail managed by the POP or IMAP servers. An effective simple mail server would involve several components:
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A central mail server running on the gateway host Each client running Sendmail as a nullclient Masquerade all mail to use the domain address only, not host addresses A POP or IMAP server running on the gateway host to handle received mail
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The nullclient version of Sendmail is a stripped down configuration that simply forwards all mail to the central server. It will not relay mail, nor will it deliver any mail locally. To configure a Sendmail client, you first need to comment out the DAEMON_OPTIONS line in the default Red Hat sendmail.mc file by placing a dnl word in front of it, as shown here. Removing this feature will allow you to receive messages over your local network. This entry is restricting Sendmail to the localhost (127.0.0.1):
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dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
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In your network, you will want your Sendmail clients to relay their messages through a central mail server, not to operate as servers themselves. You do this by specifying that they are null clients, as well as listing the mail server operating as the mail hub for their network. To configure Sendmail as a null client, you use the nullclient feature. Then define the MAIL_HUB feature to list the mail server for the network. In this example, the Sendmail mail server is running on turtle.mytrek.com.
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FEATURE('nullclient')dnl define('MAIL_HUB', 'turtle.mytrek.com')dnl
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You could also specify the hub with the nullclient feature.
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FEATURE('nullclient', 'turtle.mytrek.com')dnl
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Once you have made your changes on a host, restart Sendmail on it:
service sendmail restart
Sendmail Server Configuration
To configure Sendmail as a server, you need to allow it to accept and relay messages for hosts in your local domain. You do this by adding the feature relay_entire_domain:
FEATURE(relay_entire_domain)dnl
Should your local network also specify mail exchange servers where mail is to be sent and received for certain hosts, then you also have to add the relay_based_on_MX feature:
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