My web site - 622 Part V . Running Servers You must
622 Part V . Running Servers You must be able to access the server from clients, although you may only need to do so from clients within your network. In either case, you should read over the information about DNS and A records in the previous section. Common Packages Two software packages will be used by both system configurations. You ll install these programs first so that they are (mostly) ready when the system is ready to use them. . SpamAssassin (http://spamassassin.apache.org/) is a spam filtering program written in Perl. It uses a large set of rules to help determine how spammy a message looks and assigns a score based on the total of the rule values. For performance reasons, SpamAssassin uses a background daemon called spamd to perform message analysis. Access to this daemon is performed through the spamc client. A spamassassin command that performs the analysis without using spamd is also installed but is not used by either of the example configurations in this chapter. . ClamAV (http://www.clamav.net) is an open source virus scanner that detects more than 20,000 viruses, worms, and Trojans. It uses a virus pattern database to identify viruses and includes a program named freshclam that handles updating the database automatically. Like SpamAssassin, ClamAV includes a daemon (clamd), a client (clamdscan), and a second command-line tool that does not use the daemon (clamscan). The daemon is used in the sendmail setup but is not used by the Postfix setup for logistical reasons. You ll use APT to install these two programs, which are contained in the clamav and spamassassin packages: # apt-get install clamav spamassassin Debconf will ask you several questions about the configuration for ClamAV: . For the virus update method, select either Daemon or Cron. The former is best for most situations. . Select the appropriate source for the virus database. The second part of the server name is the country code, so U.S. residents will want to select db.us. clamav.net. . You may be prompted for HTTP proxy information. If you have a direct connection to the Internet, you probably don t need to enter anything here. If you re uncertain, you can ask your network administrator or the technical support at your ISP whether you need a proxy server to access Web pages. Now that the system is prepared, you can proceed to the section containing the configuration that you have selected.
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