Web hosting reseller - 619Chapter 24Running a Mail ServerServer Configuration OptionsThis section
619Chapter 24Running a Mail ServerServer Configuration OptionsThis section examines two different server configurations. Both configurations pro- vide the same basic features (mail delivery, complete with spam and virus filters) but do so in very different ways. Read the descriptions, decide which configuration isright for you, and then proceed to the Preparing Your System section for informa- tion about how your system should be configured before you begin the mail systeminstallation. The features available in these two configurations are a result of how they re beingconfigured and not a result of a lack of features in either sendmail or Postfix. Bothprograms support nearly the same set of features. The choice of which to config- ure in what manner was completely arbitrary for the examples in this chapter, andthe diversity is intended to help broaden your experience with mail systems. The first configuration demonstrated is based on sendmail, which provides theMTA and MDA functions. Mail retrieval is provided by Qpopper using the POP3 pro- tocol. Direct access to mailboxes is also available using Mutt. All content filtering(spam and virus) takes place before messages are accepted by the server. With theexception of the spam and virus filtering, this is a configuration that you will find onmost traditional mail servers. This configuration is suitable for situations in whichthe following apply: .Users will be downloading messages directly to their systems for viewing. Optionally, Mutt can be installed to allow users to check new messagesthrough SSH (secure shell) connections when they are not at their workstation. .Conditions (business or otherwise) require that the server administrator havethe capability to control acceptable message content. The second configuration is based on Postfix, which provides the MTA and remoteMDA functions. Local MDA functions, including calls to the content filters and sort- ing, are provided by maildrop. Mail access is provided through the IMAP facilities incourier-imap. This configuration is suitable for situations in which the followingapply: .Messages may be left on the server to allow central backups. .The capability to access all messages remotely is desirable. .Individualized content filter settings are desirable. This second option is great for home systems on broadband connections. As longas your Internet service provider will permit it, you can use your own mail serverand get to your mail whether you re at home or away. If you do not have analways-on connection, you can still use this method to run a mail server that isaccessible to machines within your own network. NoteNote33_
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