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The Post Office Protocol (POP) allows a remote server to hold mail for users who can then fetch their mail from it when they are ready. Unlike Sendmail and procmail, which deliver mail messages directly to a user account on a Linux system, the POP protocol holds mail until a user accesses his or her account on the POP server. The POP server then transfers any received messages to the user's local mailbox. Servers are often used by ISPs to provide Internet mail services for users. Instead of sending mail directly to a user's machine, the mail resides in the POP server until it's retrieved. You can access the POP server from different hosts; however, when you do, all the messages are transferred to that host. They are not kept on the POP server (though you can set an option to keep them). The POP server simply forwards your messages on the requesting host. When you access your messages from a certain computer, they will be transferred to that computer and erased from the POP server. If you access your POP server again from a different computer, those previous messages will be gone. The POP protocol provides a set of commands you can use to directly test a POP server. You can access the POP server on port 110 using telnet and then enter a series of POP commands to check the server's performance. The following example connects to the turtle.mytrek.com POP server using telnet on port 110:
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telnet turtle.mytrek.com 110
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You can then log in to an account using the USER and PASSWORD commands. The LIST command will list messages and the RETR command will display a message. Use DELE to delete a message. Use the QUIT command to end the session.
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Note The current version of the POP protocol is known as POP3, whereas POP2 is an earlier one that still may be in use in some places.
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Red Hat Linux includes in its distribution the University of Washington POP server (ftp.cac.washington.edu/imap), which is part of the University of Washington's imap RPM package. Simply install the package, which is already done as part of the standard install (both POP2 and POP3 servers are installed). The server daemons are called ipop2d and ipop3d. Your Linux system then runs as a POP2 and POP3 server for your network. These servers are run through xinetd. The POP3 server uses the ipop3 file in the /etc/xinetd.d shown here:
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# default: off # description: The POP3 service allows remote users to access their mail \ # using POP3 client such as Netscape Communicator, Mutt, \ # or fetchmail. service pop3 { disable = no socket_type = stream wait = no user = root server = /usr/sbin/ipop3d log_on_success += USERID log_on_failure += USERID }
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The following command would turn the server on.
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chkconfig ipop3 on
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Once you have installed a POP server, you add accounts to it by simply adding standard user accounts on the host it is running on. You would not need to set up a home directory for them, though. Users then access their account using a user name and password set up on the POP server's host. For example, to set up a POP user account for a POP server running on the host turtle.mytrek.com, you log in as root on turtle.mytrek.com and create a new user as you normally would for that host. To create a POP user account for larisa, just create a larisa user on the turtle.mytrek.com host. Both the POP and IMAP Washington servers support Open SSL authentication and encryption. The SSL enabled versions of the POP and IMAP servers have the names pop3s and imaps. Use chkconfig to turn them on or off.
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