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All messages will appear to originate from the mail server s host For example, if your Sendmail mail server is running on turtlemytrekcom, mail sent from a localhost called rabbitmytrekcom will appear to have been sent from turtlemytrekcom You can also masquerade recipient addresses, so that mail sent to users on your localhost will be sent instead to the masqueraded address Use the allmasquerade feature to enable recipient masquerading:
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Sendmail can be used either as a mail server, handling mail for various hosts on a network, or as a mail client, managing mail for local users on a particular host In a simple network configuration, you have each host running Sendmail in a client configuration and one host operating as a mail server, relaying mail for the network hosts For a local network connected to the Internet, your localhosts will run Sendmail in a client configuration, and your gateway will run Sendmail in a server configuration (though the mail server will not have to necessarily run on the gateway) The mail server relays messages from the local network hosts out to the Internet The mail server can also be used to block unwanted access from outside hosts, such as those sending spam mail A basic client or server Sendmail configuration involves just a few features in the /etc/mail/sendmailmc file The default configuration installed on your system allows use on a single host, managing messages between users on that host To enable client and server use, you will need to make changes to the /etc/mail/sendmailmc file
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Some distributions, like Fedora, initially configure 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 sendmailmc and /etc/mail/access files A simple network configuration has Sendmail running on each host, handling both mail sent between users on that host and mail to and from users on other hosts For each Sendmail server configuration, you make the changes described in the following section on simple local network configuration For messages sent between hosts on your network, you only need to run the Sendmail server on each, making a few changes to their Sendmail configurations The Sendmail server on one of your hosts can be configured to handle the task of relaying messages between hosts Using the network example described earlier, the hosts turtle, rabbit, and lizard will be running their own Sendmail servers The Sendmail server on the turtle host will be configured to relay messages between all the hosts, itself included On each host on your network, edit the /etc/mail/sendmailmc file and make the following changes Comment out the DAEMON_OPTIONS line in the default sendmailmc 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 restricts Sendmail to the localhost (127001):
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dnl DAEMON_OPTIONS('Port=smtp,Addr=127001, Name=MTA')dnl
In the sendmailmc file located on the host that you want to have handle the relaying of messages, you need to also add the following line:
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Run the m4 operation to install the changed configuration and then restart the server You can now email messages from one user to another across your network For example, george@turtlemytrekcom can now email a message to larisa@rabbitmytrekcom The local Sendmail servers will take care of sending and delivering mail both to users within their hosts and those located on other network hosts
Configuring Sendmail for a Centralized Mail Server
Alternatively, you can set up a central mail server to handle all the mail on your network Mail clients on various hosts can send their messages to the central mail server, which will 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 null client versions of the Sendmail server running on localhosts Any mail sent from localhosts will be automatically forwarded to the central mail server Received mail can only be delivered to the central server, usually to a POP or IMAP server also running on the central server s host Users can then access the POP server to retrieve their mail For a centralized configuration, it makes sense to treat users as having their network domain as their address, rather than separate hosts in their network Thus the user cece on rabbitmytrekcom uses the mail address cece@mytrekcom, not cece@rabbitmytrekcom Users can have the same name as those on their respective hosts, but corresponding users
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