Chapter 9, where we talk about the daemon that handles UNIX print jobs.Some Internet resource servers, such as telnet and FTP, are standard parts of all UNIX distributions. Some UNIX (and Linux) distributions also include Internet servers for other resources, such as e-mail and news. In some cases, these servers are included with your Web server. If neither your UNIX nor Web server package includes the servers you need, you have to find or purchase them separately. Fortunately, free versions abound on Web sites and FTP sites on the Internet.Here are a few tips about what you may need to help get you started:
E-mail: If you want to serve your own e-mail, you need an SMTP server and a POP or IMAP server. SMTP (Simple Mail Transfer Protocol) defines the way computers pass a mail message to each other until it gets delivered to a user’s mailbox. POP (Post Office Protocol) and IMAP (Internet Mail Access Protocol) define how the user who got the message retrieves it from the mailbox. Some mail clients require POP; others, such as Pine, require IMAP instead. The most popular, although not the best, SMTP server is called sendmail , and large books are devoted to its care and feeding.
Telnet , ssh , and FTP: Use the telnet , ssh and FTP daemons included in your UNIX or Linux distribution. Because security issues are always a major concern when you give unknown computers access to your computer, be vigilant about potential security breaches and be sure to install new versions if security holes are reported.
Other resources you may consider providing are the highly addictive Internet Relay Chat, equally addictive games such as MUDs (Multi-User Dungeons) and MUSHes (Multi-User Shared Hallucinations), Gopher, and streaming video and audio. As with the basic services, you have to determine whether your OS or Web server package includes the server software you need.
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