486 Part IV . Implementing Network Services in (Web site directory)
486 Part IV . Implementing Network Services in SUSE Linux in the beginning of this section, the primary reason that people choose a mail transfer agent other than sendmail is the complexity of its configuration files, which are totally hidden by YaST s graphical interface. If you decide to use sendmail, you may eventually want to delve more deeply into manual aspects of its configuration. A number of excellent books dedicated to sendmail are currently available, as are a number of online resources. The best online resource for information about send- mail is the home page for the Sendmail Consortium, which maintains and develops the freeware version of sendmail. Go to www.sendmail.org for a good deal of information local to their site, as well as pointers to many of the best sites on the Internet for sendmail information. Qpopper When your MTA is configured, you need to be able to access your mail using a mail client by connecting to an MDA. You have three ways of remotely accessing your mail: . By logging in to the server and accessing the mail spool directly . Through Internet Message Access Protocol (IMAP) . Through Post Office Protocol (POP3) We will talk about POP3 and IMAP in this section of the chapter, starting with POP3. POP3 enables you to receive your mail from a server and store it on your local disk. When the mail has been received from the server, it is deleted from the server. POP3 is a good mail storage option for laptop users as your mail is always local to your machine. IMAP takes a different approach by always storing your mail messages on the server. This gives you the added benefit of being able to access all of your mail (including subfolders) wherever you are. If you use POP3, you are able to see all of your mail that you have downloaded only if you have your laptop or desktop machine that you use to download your POP3 mail with you. One of the best POP3 servers is Qpopper. In addition to being the standard for POP3 retrieval, it is actively maintained and also supports extended authentication methods from the standard cleartext username and passwords. You will need to install Qpopper using YaST, and then enable POP3 access in /etc/inetd.conf. Open /etc/inetd.conf and uncomment the popper line relating to POP3 (see Listing 17-3). Listing 17-3: Enabling Qpopper in inetd # Pop et al
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