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14: Con guring Linux Network Services
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Your Linux distribution includes an MTA that runs by default on the system Two MTAs are commonly implemented on Linux:
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These MTAs can be used to receive sent e-mail messages from MUAs However, MUAs can t download messages from them using the POP3 or IMAP protocols To add this functionality, you can install the imap package on your Linux system This package installs IMAP and POP3 daemons that you can use to transfer e-mail messages from your Postfix or sendmail MTAs to your e-mail client software Both of these daemons are managed using the xinetd super daemon You enable these daemons using the /etc/xinetdd/imap file Both of these daemons are disabled by default, as shown in Figure 14-69 If you want to provide POP3 and IMAP support, you will need to enable these daemons in the imap file and then restart the xinetd daemon Let s discuss how you access your mail next
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You may have noticed a message indicating a user has new mail in many of the images shown in this chapter You may have wondered how you go about accessing and reading these mail messages You have several options
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FIGURE 14-69
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FIGURE 14-70
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Using mail to read messages
First, you can read them directly from the command line by entering mail at the shell prompt When you do, a list of messages is displayed, as shown in Figure 14-70 These messages are stored in your user s mail queue, which is in the /var/spool/ mail/ directory The mail utility reads your messages directly out of this queue file Because you re running the mail utility on the same system where the queue resides, you don t need POP3 or IMAP support configured to access your messages To read a message, simply enter the message number at the prompt You can delete a message by entering d message_number at the prompt You can quit mail by entering q To send a message, you can invoke mail from the shell prompt by entering mail recipient_address You can then enter a subject line and the body text of your message, as shown in Figure 14-71 Press to send the message When you do, the message is delivered to the other user s mail queue by the MTA on your system In Figure 14-72, the message composed in Figure 14-71 has been delivered to the ksanders user In addition to mail, you can also use the mutt utility to read mail The mutt utility is a little easier to use than mail for many end users To use mutt, you must first install the mutt package with rpm After doing so, you can start mutt by entering mutt at the shell prompt The messages for the currently logged-in user are displayed in the mutt interface, as shown in Figure 14-73 In addition to mutt, there are many other packages available that you can install to read mail from the shell prompt The key thing to remember about these command-line utilities is that the user must run them from the shell prompt If the user isn t using the local computer
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FIGURE 14-71
Using mail to send a message
14: Con guring Linux Network Services
FIGURE 14-72
Viewing a sent message
system, then he or she has to ssh into the system to read mail If you want users to be able to download mail, then you need to enable the POP3 and IMAP daemons using xinetd, as discussed earlier Then you can choose from a wide variety of e-mail clients to download and read e-mail For example:
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When you run one of these clients for the first time, you ll be prompted to configure an incoming POP3 or IMAP server IP address, user account, and password You ll also be prompted to configure an SMTP outgoing server IP address, user account, and password After doing so, you can then use the remote e-mail client to download, read, compose, and send e-mail messages through your Linux system s MTA For example, in Figure 14-74, the Kmail utility has been configured to send and receive e-mail through the Linux system s Postfix MTA
FIGURE 14-73
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